mirror of https://github.com/n-hys/bash.git
4476 lines
116 KiB
C
4476 lines
116 KiB
C
/* jobs.c - functions that make children, remember them, and handle their termination. */
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/* This file works with both POSIX and BSD systems. It implements job
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control. */
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/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "bashtypes.h"
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#include "trap.h"
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#include <stdio.h>
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#include <signal.h>
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#include <errno.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "posixtime.h"
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#if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
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# include <sys/resource.h>
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#endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
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#if defined (HAVE_SYS_FILE_H)
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# include <sys/file.h>
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#endif
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#include "filecntl.h"
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#include <sys/ioctl.h>
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#if defined (HAVE_SYS_PARAM_H)
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#include <sys/param.h>
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#endif
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#if defined (BUFFERED_INPUT)
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# include "input.h"
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#endif
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/* Need to include this up here for *_TTY_DRIVER definitions. */
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#include "shtty.h"
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/* Define this if your output is getting swallowed. It's a no-op on
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machines with the termio or termios tty drivers. */
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/* #define DRAIN_OUTPUT */
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/* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
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#if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
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# include <bsdtty.h>
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#endif /* hpux && !TERMIOS_TTY_DRIVER */
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#include "bashansi.h"
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#include "bashintl.h"
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#include "shell.h"
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#include "jobs.h"
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#include "execute_cmd.h"
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#include "flags.h"
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#include "builtins/builtext.h"
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#include "builtins/common.h"
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#if !defined (errno)
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extern int errno;
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#endif /* !errno */
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#if !defined (HAVE_KILLPG)
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extern int killpg __P((pid_t, int));
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#endif
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#if !DEFAULT_CHILD_MAX
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# define DEFAULT_CHILD_MAX 32
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#endif
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#if !MAX_CHILD_MAX
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# define MAX_CHILD_MAX 8192
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#endif
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#if !defined (DEBUG)
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#define MAX_JOBS_IN_ARRAY 4096 /* production */
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#else
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#define MAX_JOBS_IN_ARRAY 128 /* testing */
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#endif
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/* Flag values for second argument to delete_job */
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#define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
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#define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
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/* Take care of system dependencies that must be handled when waiting for
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children. The arguments to the WAITPID macro match those to the Posix.1
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waitpid() function. */
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#if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
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# define WAITPID(pid, statusp, options) \
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wait3 ((union wait *)statusp, options, (struct rusage *)0)
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#else
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# if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
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# define WAITPID(pid, statusp, options) \
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waitpid ((pid_t)pid, statusp, options)
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# else
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# if defined (HAVE_WAIT3)
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# define WAITPID(pid, statusp, options) \
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wait3 (statusp, options, (struct rusage *)0)
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# else
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# define WAITPID(pid, statusp, options) \
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wait3 (statusp, options, (int *)0)
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# endif /* HAVE_WAIT3 */
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# endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
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#endif /* !(Ultrix && mips && _POSIX_VERSION) */
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/* getpgrp () varies between systems. Even systems that claim to be
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Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
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#if defined (GETPGRP_VOID)
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# define getpgid(p) getpgrp ()
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#else
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# define getpgid(p) getpgrp (p)
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#endif /* !GETPGRP_VOID */
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/* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
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handler for SIGCHLD. */
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#if defined (MUST_REINSTALL_SIGHANDLERS)
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# define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
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#else
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# define REINSTALL_SIGCHLD_HANDLER
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#endif /* !MUST_REINSTALL_SIGHANDLERS */
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/* Some systems let waitpid(2) tell callers about stopped children. */
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#if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
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# undef WCONTINUED
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# define WCONTINUED 0
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#endif
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#if !defined (WIFCONTINUED)
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# define WIFCONTINUED(s) (0)
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#endif
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/* The number of additional slots to allocate when we run out. */
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#define JOB_SLOTS 8
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typedef int sh_job_map_func_t __P((JOB *, int, int, int));
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/* Variables used here but defined in other files. */
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extern int subshell_environment, line_number;
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extern int posixly_correct, shell_level;
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extern int last_command_exit_value, last_command_exit_signal;
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extern int loop_level, breaking;
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extern int executing_list;
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extern int sourcelevel;
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extern int running_trap;
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extern sh_builtin_func_t *this_shell_builtin;
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extern char *shell_name, *this_command_name;
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extern sigset_t top_level_mask;
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extern procenv_t wait_intr_buf;
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extern int wait_signal_received;
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extern WORD_LIST *subst_assign_varlist;
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static struct jobstats zerojs = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
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struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
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struct bgpids bgpids = { 0, 0, 0 };
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/* The array of known jobs. */
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JOB **jobs = (JOB **)NULL;
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#if 0
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/* The number of slots currently allocated to JOBS. */
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int job_slots = 0;
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#endif
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/* The controlling tty for this shell. */
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int shell_tty = -1;
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/* The shell's process group. */
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pid_t shell_pgrp = NO_PID;
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/* The terminal's process group. */
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pid_t terminal_pgrp = NO_PID;
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/* The process group of the shell's parent. */
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pid_t original_pgrp = NO_PID;
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/* The process group of the pipeline currently being made. */
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pid_t pipeline_pgrp = (pid_t)0;
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#if defined (PGRP_PIPE)
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/* Pipes which each shell uses to communicate with the process group leader
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until all of the processes in a pipeline have been started. Then the
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process leader is allowed to continue. */
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int pgrp_pipe[2] = { -1, -1 };
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#endif
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#if 0
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/* The job which is current; i.e. the one that `%+' stands for. */
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int current_job = NO_JOB;
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/* The previous job; i.e. the one that `%-' stands for. */
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int previous_job = NO_JOB;
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#endif
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/* Last child made by the shell. */
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volatile pid_t last_made_pid = NO_PID;
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/* Pid of the last asynchronous child. */
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volatile pid_t last_asynchronous_pid = NO_PID;
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/* The pipeline currently being built. */
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PROCESS *the_pipeline = (PROCESS *)NULL;
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/* If this is non-zero, do job control. */
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int job_control = 1;
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/* Call this when you start making children. */
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int already_making_children = 0;
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/* If this is non-zero, $LINES and $COLUMNS are reset after every process
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exits from get_tty_state(). */
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int check_window_size = CHECKWINSIZE_DEFAULT;
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/* Functions local to this file. */
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static sighandler wait_sigint_handler __P((int));
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static sighandler sigchld_handler __P((int));
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static sighandler sigcont_sighandler __P((int));
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static sighandler sigstop_sighandler __P((int));
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static int waitchld __P((pid_t, int));
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static PROCESS *find_pipeline __P((pid_t, int, int *));
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static PROCESS *find_process __P((pid_t, int, int *));
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static char *current_working_directory __P((void));
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static char *job_working_directory __P((void));
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static char *j_strsignal __P((int));
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static char *printable_job_status __P((int, PROCESS *, int));
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static PROCESS *find_last_proc __P((int, int));
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static pid_t find_last_pid __P((int, int));
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static int set_new_line_discipline __P((int));
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static int map_over_jobs __P((sh_job_map_func_t *, int, int));
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static int job_last_stopped __P((int));
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static int job_last_running __P((int));
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static int most_recent_job_in_state __P((int, JOB_STATE));
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static int find_job __P((pid_t, int, PROCESS **));
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static int print_job __P((JOB *, int, int, int));
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static int process_exit_status __P((WAIT));
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static int process_exit_signal __P((WAIT));
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static int set_job_status_and_cleanup __P((int));
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static WAIT job_signal_status __P((int));
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static WAIT raw_job_exit_status __P((int));
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static void notify_of_job_status __P((void));
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static void reset_job_indices __P((void));
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static void cleanup_dead_jobs __P((void));
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static int processes_in_job __P((int));
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static void realloc_jobs_list __P((void));
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static int compact_jobs_list __P((int));
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static int discard_pipeline __P((PROCESS *));
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static void add_process __P((char *, pid_t));
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static void print_pipeline __P((PROCESS *, int, int, FILE *));
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static void pretty_print_job __P((int, int, FILE *));
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static void set_current_job __P((int));
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static void reset_current __P((void));
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static void set_job_running __P((int));
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static void setjstatus __P((int));
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static int maybe_give_terminal_to __P((pid_t, pid_t, int));
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static void mark_all_jobs_as_dead __P((void));
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static void mark_dead_jobs_as_notified __P((int));
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static void restore_sigint_handler __P((void));
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#if defined (PGRP_PIPE)
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static void pipe_read __P((int *));
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#endif
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static struct pidstat *bgp_alloc __P((pid_t, int));
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static struct pidstat *bgp_add __P((pid_t, int));
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static int bgp_delete __P((pid_t));
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static void bgp_clear __P((void));
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static int bgp_search __P((pid_t));
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static void bgp_prune __P((void));
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#if defined (ARRAY_VARS)
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static int *pstatuses; /* list of pipeline statuses */
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static int statsize;
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#endif
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/* Used to synchronize between wait_for and other functions and the SIGCHLD
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signal handler. */
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static int sigchld;
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static int queue_sigchld;
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#define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
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#define UNQUEUE_SIGCHLD(os) \
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do { \
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queue_sigchld--; \
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if (queue_sigchld == 0 && os != sigchld) \
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waitchld (-1, 0); \
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} while (0)
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static SigHandler *old_tstp, *old_ttou, *old_ttin;
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static SigHandler *old_cont = (SigHandler *)SIG_DFL;
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/* A place to temporarily save the current pipeline. */
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static PROCESS *saved_pipeline;
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static int saved_already_making_children;
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/* Set this to non-zero whenever you don't want the jobs list to change at
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all: no jobs deleted and no status change notifications. This is used,
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for example, when executing SIGCHLD traps, which may run arbitrary
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commands. */
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static int jobs_list_frozen;
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static char retcode_name_buffer[64];
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#if !defined (_POSIX_VERSION)
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/* These are definitions to map POSIX 1003.1 functions onto existing BSD
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library functions and system calls. */
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#define setpgid(pid, pgrp) setpgrp (pid, pgrp)
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#define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
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pid_t
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tcgetpgrp (fd)
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int fd;
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{
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pid_t pgrp;
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/* ioctl will handle setting errno correctly. */
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if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
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return (-1);
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return (pgrp);
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}
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#endif /* !_POSIX_VERSION */
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/* Initialize the global job stats structure and other bookkeeping variables */
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void
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init_job_stats ()
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{
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js = zerojs;
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}
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/* Return the working directory for the current process. Unlike
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job_working_directory, this does not call malloc (), nor do any
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of the functions it calls. This is so that it can safely be called
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from a signal handler. */
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static char *
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current_working_directory ()
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{
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char *dir;
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static char d[PATH_MAX];
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dir = get_string_value ("PWD");
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if (dir == 0 && the_current_working_directory && no_symbolic_links)
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dir = the_current_working_directory;
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if (dir == 0)
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{
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dir = getcwd (d, sizeof(d));
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if (dir)
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dir = d;
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}
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return (dir == 0) ? "<unknown>" : dir;
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}
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/* Return the working directory for the current process. */
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static char *
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job_working_directory ()
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{
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char *dir;
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dir = get_string_value ("PWD");
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if (dir)
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return (savestring (dir));
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dir = get_working_directory ("job-working-directory");
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if (dir)
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return (dir);
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return (savestring ("<unknown>"));
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}
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void
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making_children ()
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{
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if (already_making_children)
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return;
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already_making_children = 1;
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start_pipeline ();
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}
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void
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stop_making_children ()
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{
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already_making_children = 0;
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}
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void
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cleanup_the_pipeline ()
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{
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PROCESS *disposer;
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sigset_t set, oset;
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BLOCK_CHILD (set, oset);
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disposer = the_pipeline;
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the_pipeline = (PROCESS *)NULL;
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UNBLOCK_CHILD (oset);
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if (disposer)
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discard_pipeline (disposer);
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}
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void
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save_pipeline (clear)
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int clear;
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{
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saved_pipeline = the_pipeline;
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if (clear)
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the_pipeline = (PROCESS *)NULL;
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saved_already_making_children = already_making_children;
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}
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void
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restore_pipeline (discard)
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int discard;
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{
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PROCESS *old_pipeline;
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old_pipeline = the_pipeline;
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the_pipeline = saved_pipeline;
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already_making_children = saved_already_making_children;
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if (discard && old_pipeline)
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discard_pipeline (old_pipeline);
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}
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/* Start building a pipeline. */
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void
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start_pipeline ()
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{
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if (the_pipeline)
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{
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cleanup_the_pipeline ();
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pipeline_pgrp = 0;
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#if defined (PGRP_PIPE)
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sh_closepipe (pgrp_pipe);
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#endif
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}
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#if defined (PGRP_PIPE)
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if (job_control)
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{
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if (pipe (pgrp_pipe) == -1)
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sys_error (_("start_pipeline: pgrp pipe"));
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}
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#endif
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}
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/* Stop building a pipeline. Install the process list in the job array.
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This returns the index of the newly installed job.
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DEFERRED is a command structure to be executed upon satisfactory
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execution exit of this pipeline. */
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int
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stop_pipeline (async, deferred)
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int async;
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COMMAND *deferred;
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{
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register int i, j;
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JOB *newjob;
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sigset_t set, oset;
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BLOCK_CHILD (set, oset);
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#if defined (PGRP_PIPE)
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/* The parent closes the process group synchronization pipe. */
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sh_closepipe (pgrp_pipe);
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#endif
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cleanup_dead_jobs ();
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if (js.j_jobslots == 0)
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{
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js.j_jobslots = JOB_SLOTS;
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jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *));
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/* Now blank out these new entries. */
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for (i = 0; i < js.j_jobslots; i++)
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jobs[i] = (JOB *)NULL;
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js.j_firstj = js.j_lastj = js.j_njobs = 0;
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}
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/* Scan from the last slot backward, looking for the next free one. */
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/* XXX - revisit this interactive assumption */
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/* XXX - this way for now */
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if (interactive)
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{
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for (i = js.j_jobslots; i; i--)
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if (jobs[i - 1])
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break;
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}
|
|
else
|
|
{
|
|
#if 0
|
|
/* This wraps around, but makes it inconvenient to extend the array */
|
|
for (i = js.j_lastj+1; i != js.j_lastj; i++)
|
|
{
|
|
if (i >= js.j_jobslots)
|
|
i = 0;
|
|
if (jobs[i] == 0)
|
|
break;
|
|
}
|
|
if (i == js.j_lastj)
|
|
i = js.j_jobslots;
|
|
#else
|
|
/* This doesn't wrap around yet. */
|
|
for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++)
|
|
if (jobs[i] == 0)
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
/* Do we need more room? */
|
|
|
|
/* First try compaction */
|
|
if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY)
|
|
i = compact_jobs_list (0);
|
|
|
|
/* If we can't compact, reallocate */
|
|
if (i == js.j_jobslots)
|
|
{
|
|
js.j_jobslots += JOB_SLOTS;
|
|
jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *)));
|
|
|
|
for (j = i; j < js.j_jobslots; j++)
|
|
jobs[j] = (JOB *)NULL;
|
|
}
|
|
|
|
/* Add the current pipeline to the job list. */
|
|
if (the_pipeline)
|
|
{
|
|
register PROCESS *p;
|
|
int any_running, any_stopped, n;
|
|
|
|
newjob = (JOB *)xmalloc (sizeof (JOB));
|
|
|
|
for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next)
|
|
;
|
|
p->next = (PROCESS *)NULL;
|
|
newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *);
|
|
for (p = newjob->pipe; p->next; p = p->next)
|
|
;
|
|
p->next = newjob->pipe;
|
|
|
|
the_pipeline = (PROCESS *)NULL;
|
|
newjob->pgrp = pipeline_pgrp;
|
|
pipeline_pgrp = 0;
|
|
|
|
newjob->flags = 0;
|
|
|
|
/* Flag to see if in another pgrp. */
|
|
if (job_control)
|
|
newjob->flags |= J_JOBCONTROL;
|
|
|
|
/* Set the state of this pipeline. */
|
|
p = newjob->pipe;
|
|
any_running = any_stopped = 0;
|
|
do
|
|
{
|
|
any_running |= PRUNNING (p);
|
|
any_stopped |= PSTOPPED (p);
|
|
p = p->next;
|
|
}
|
|
while (p != newjob->pipe);
|
|
|
|
newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD);
|
|
newjob->wd = job_working_directory ();
|
|
newjob->deferred = deferred;
|
|
|
|
newjob->j_cleanup = (sh_vptrfunc_t *)NULL;
|
|
newjob->cleanarg = (PTR_T) NULL;
|
|
|
|
jobs[i] = newjob;
|
|
if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND))
|
|
setjstatus (i);
|
|
if (newjob->state == JDEAD)
|
|
{
|
|
js.c_reaped += n; /* wouldn't have been done since this was not part of a job */
|
|
js.j_ndead++;
|
|
}
|
|
js.c_injobs += n;
|
|
|
|
js.j_lastj = i;
|
|
js.j_njobs++;
|
|
}
|
|
else
|
|
newjob = (JOB *)NULL;
|
|
|
|
if (newjob)
|
|
js.j_lastmade = newjob;
|
|
|
|
if (async)
|
|
{
|
|
if (newjob)
|
|
{
|
|
newjob->flags &= ~J_FOREGROUND;
|
|
newjob->flags |= J_ASYNC;
|
|
js.j_lastasync = newjob;
|
|
}
|
|
reset_current ();
|
|
}
|
|
else
|
|
{
|
|
if (newjob)
|
|
{
|
|
newjob->flags |= J_FOREGROUND;
|
|
/*
|
|
* !!!!! NOTE !!!!! (chet@ins.cwru.edu)
|
|
*
|
|
* The currently-accepted job control wisdom says to set the
|
|
* terminal's process group n+1 times in an n-step pipeline:
|
|
* once in the parent and once in each child. This is where
|
|
* the parent gives it away.
|
|
*
|
|
* Don't give the terminal away if this shell is an asynchronous
|
|
* subshell.
|
|
*
|
|
*/
|
|
if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0)
|
|
maybe_give_terminal_to (shell_pgrp, newjob->pgrp, 0);
|
|
}
|
|
}
|
|
|
|
stop_making_children ();
|
|
UNBLOCK_CHILD (oset);
|
|
return (newjob ? i : js.j_current);
|
|
}
|
|
|
|
/* Functions to manage the list of exited background pids whose status has
|
|
been saved. */
|
|
|
|
static struct pidstat *
|
|
bgp_alloc (pid, status)
|
|
pid_t pid;
|
|
int status;
|
|
{
|
|
struct pidstat *ps;
|
|
|
|
ps = (struct pidstat *)xmalloc (sizeof (struct pidstat));
|
|
ps->pid = pid;
|
|
ps->status = status;
|
|
ps->next = (struct pidstat *)0;
|
|
return ps;
|
|
}
|
|
|
|
static struct pidstat *
|
|
bgp_add (pid, status)
|
|
pid_t pid;
|
|
int status;
|
|
{
|
|
struct pidstat *ps;
|
|
|
|
ps = bgp_alloc (pid, status);
|
|
|
|
if (bgpids.list == 0)
|
|
{
|
|
bgpids.list = bgpids.end = ps;
|
|
bgpids.npid = 0; /* just to make sure */
|
|
}
|
|
else
|
|
{
|
|
bgpids.end->next = ps;
|
|
bgpids.end = ps;
|
|
}
|
|
bgpids.npid++;
|
|
|
|
if (bgpids.npid > js.c_childmax)
|
|
bgp_prune ();
|
|
|
|
return ps;
|
|
}
|
|
|
|
static int
|
|
bgp_delete (pid)
|
|
pid_t pid;
|
|
{
|
|
struct pidstat *prev, *p;
|
|
|
|
for (prev = p = bgpids.list; p; prev = p, p = p->next)
|
|
if (p->pid == pid)
|
|
{
|
|
prev->next = p->next; /* remove from list */
|
|
break;
|
|
}
|
|
|
|
if (p == 0)
|
|
return 0; /* not found */
|
|
|
|
#if defined (DEBUG)
|
|
itrace("bgp_delete: deleting %d", pid);
|
|
#endif
|
|
|
|
/* Housekeeping in the border cases. */
|
|
if (p == bgpids.list)
|
|
bgpids.list = bgpids.list->next;
|
|
else if (p == bgpids.end)
|
|
bgpids.end = prev;
|
|
|
|
bgpids.npid--;
|
|
if (bgpids.npid == 0)
|
|
bgpids.list = bgpids.end = 0;
|
|
else if (bgpids.npid == 1)
|
|
bgpids.end = bgpids.list; /* just to make sure */
|
|
|
|
free (p);
|
|
return 1;
|
|
}
|
|
|
|
/* Clear out the list of saved statuses */
|
|
static void
|
|
bgp_clear ()
|
|
{
|
|
struct pidstat *ps, *p;
|
|
|
|
for (ps = bgpids.list; ps; )
|
|
{
|
|
p = ps;
|
|
ps = ps->next;
|
|
free (p);
|
|
}
|
|
bgpids.list = bgpids.end = 0;
|
|
bgpids.npid = 0;
|
|
}
|
|
|
|
/* Search for PID in the list of saved background pids; return its status if
|
|
found. If not found, return -1. */
|
|
static int
|
|
bgp_search (pid)
|
|
pid_t pid;
|
|
{
|
|
struct pidstat *ps;
|
|
|
|
for (ps = bgpids.list ; ps; ps = ps->next)
|
|
if (ps->pid == pid)
|
|
return ps->status;
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
bgp_prune ()
|
|
{
|
|
struct pidstat *ps;
|
|
|
|
while (bgpids.npid > js.c_childmax)
|
|
{
|
|
ps = bgpids.list;
|
|
bgpids.list = bgpids.list->next;
|
|
free (ps);
|
|
bgpids.npid--;
|
|
}
|
|
}
|
|
|
|
/* Reset the values of js.j_lastj and js.j_firstj after one or both have
|
|
been deleted. The caller should check whether js.j_njobs is 0 before
|
|
calling this. This wraps around, but the rest of the code does not. At
|
|
this point, it should not matter. */
|
|
static void
|
|
reset_job_indices ()
|
|
{
|
|
int old;
|
|
|
|
if (jobs[js.j_firstj] == 0)
|
|
{
|
|
old = js.j_firstj++;
|
|
if (old >= js.j_jobslots)
|
|
old = js.j_jobslots - 1;
|
|
while (js.j_firstj != old)
|
|
{
|
|
if (js.j_firstj >= js.j_jobslots)
|
|
js.j_firstj = 0;
|
|
if (jobs[js.j_firstj] || js.j_firstj == old) /* needed if old == 0 */
|
|
break;
|
|
js.j_firstj++;
|
|
}
|
|
if (js.j_firstj == old)
|
|
js.j_firstj = js.j_lastj = js.j_njobs = 0;
|
|
}
|
|
if (jobs[js.j_lastj] == 0)
|
|
{
|
|
old = js.j_lastj--;
|
|
if (old < 0)
|
|
old = 0;
|
|
while (js.j_lastj != old)
|
|
{
|
|
if (js.j_lastj < 0)
|
|
js.j_lastj = js.j_jobslots - 1;
|
|
if (jobs[js.j_lastj] || js.j_lastj == old) /* needed if old == js.j_jobslots */
|
|
break;
|
|
js.j_lastj--;
|
|
}
|
|
if (js.j_lastj == old)
|
|
js.j_firstj = js.j_lastj = js.j_njobs = 0;
|
|
}
|
|
}
|
|
|
|
/* Delete all DEAD jobs that the user had received notification about. */
|
|
static void
|
|
cleanup_dead_jobs ()
|
|
{
|
|
register int i;
|
|
int os;
|
|
|
|
if (js.j_jobslots == 0 || jobs_list_frozen)
|
|
return;
|
|
|
|
QUEUE_SIGCHLD(os);
|
|
|
|
/* XXX could use js.j_firstj and js.j_lastj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
|
|
if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i))
|
|
delete_job (i, 0);
|
|
}
|
|
|
|
#if defined (COPROCESS_SUPPORT)
|
|
coproc_reap ();
|
|
#endif
|
|
|
|
UNQUEUE_SIGCHLD(os);
|
|
}
|
|
|
|
static int
|
|
processes_in_job (job)
|
|
int job;
|
|
{
|
|
int nproc;
|
|
register PROCESS *p;
|
|
|
|
nproc = 0;
|
|
p = jobs[job]->pipe;
|
|
do
|
|
{
|
|
p = p->next;
|
|
nproc++;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
|
|
return nproc;
|
|
}
|
|
|
|
static void
|
|
delete_old_job (pid)
|
|
pid_t pid;
|
|
{
|
|
PROCESS *p;
|
|
int job;
|
|
|
|
job = find_job (pid, 0, &p);
|
|
if (job != NO_JOB)
|
|
{
|
|
#ifdef DEBUG
|
|
itrace ("delete_old_job: found pid %d in job %d with state %d", pid, job, jobs[job]->state);
|
|
#endif
|
|
if (JOBSTATE (job) == JDEAD)
|
|
delete_job (job, DEL_NOBGPID);
|
|
else
|
|
{
|
|
#ifdef DEBUG
|
|
internal_warning (_("forked pid %d appears in running job %d"), pid, job+1);
|
|
#endif
|
|
if (p)
|
|
p->pid = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Reallocate and compress the jobs list. This returns with a jobs array
|
|
whose size is a multiple of JOB_SLOTS and can hold the current number of
|
|
jobs. Heuristics are used to minimize the number of new reallocs. */
|
|
static void
|
|
realloc_jobs_list ()
|
|
{
|
|
sigset_t set, oset;
|
|
int nsize, i, j, ncur, nprev;
|
|
JOB **nlist;
|
|
|
|
ncur = nprev = NO_JOB;
|
|
nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS);
|
|
nsize *= JOB_SLOTS;
|
|
i = js.j_njobs % JOB_SLOTS;
|
|
if (i == 0 || i > (JOB_SLOTS >> 1))
|
|
nsize += JOB_SLOTS;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
nlist = (js.j_jobslots == nsize) ? jobs : (JOB **) xmalloc (nsize * sizeof (JOB *));
|
|
|
|
js.c_reaped = js.j_ndead = 0;
|
|
for (i = j = 0; i < js.j_jobslots; i++)
|
|
if (jobs[i])
|
|
{
|
|
if (i == js.j_current)
|
|
ncur = j;
|
|
if (i == js.j_previous)
|
|
nprev = j;
|
|
nlist[j++] = jobs[i];
|
|
if (jobs[i]->state == JDEAD)
|
|
{
|
|
js.j_ndead++;
|
|
js.c_reaped += processes_in_job (i);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
itrace ("realloc_jobs_list: resize jobs list from %d to %d", js.j_jobslots, nsize);
|
|
itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js.j_lastj, (j > 0) ? j - 1 : 0);
|
|
itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js.j_njobs, j);
|
|
itrace ("realloc_jobs_list: js.j_ndead %d js.c_reaped %d", js.j_ndead, js.c_reaped);
|
|
#endif
|
|
|
|
js.j_firstj = 0;
|
|
js.j_lastj = (j > 0) ? j - 1 : 0;
|
|
js.j_njobs = j;
|
|
js.j_jobslots = nsize;
|
|
|
|
/* Zero out remaining slots in new jobs list */
|
|
for ( ; j < nsize; j++)
|
|
nlist[j] = (JOB *)NULL;
|
|
|
|
if (jobs != nlist)
|
|
{
|
|
free (jobs);
|
|
jobs = nlist;
|
|
}
|
|
|
|
if (ncur != NO_JOB)
|
|
js.j_current = ncur;
|
|
if (nprev != NO_JOB)
|
|
js.j_previous = nprev;
|
|
|
|
/* Need to reset these */
|
|
if (js.j_current == NO_JOB || js.j_previous == NO_JOB || js.j_current > js.j_lastj || js.j_previous > js.j_lastj)
|
|
reset_current ();
|
|
|
|
#if 0
|
|
itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js.j_current, js.j_previous);
|
|
#endif
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
/* Compact the jobs list by removing dead jobs. Assume that we have filled
|
|
the jobs array to some predefined maximum. Called when the shell is not
|
|
the foreground process (subshell_environment != 0). Returns the first
|
|
available slot in the compacted list. If that value is js.j_jobslots, then
|
|
the list needs to be reallocated. The jobs array may be in new memory if
|
|
this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
|
|
static int
|
|
compact_jobs_list (flags)
|
|
int flags;
|
|
{
|
|
if (js.j_jobslots == 0 || jobs_list_frozen)
|
|
return js.j_jobslots;
|
|
|
|
reap_dead_jobs ();
|
|
realloc_jobs_list ();
|
|
|
|
#if 0
|
|
itrace("compact_jobs_list: returning %d", (js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
|
|
#endif
|
|
|
|
return ((js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
|
|
}
|
|
|
|
/* Delete the job at INDEX from the job list. Must be called
|
|
with SIGCHLD blocked. */
|
|
void
|
|
delete_job (job_index, dflags)
|
|
int job_index, dflags;
|
|
{
|
|
register JOB *temp;
|
|
PROCESS *proc;
|
|
int ndel;
|
|
|
|
if (js.j_jobslots == 0 || jobs_list_frozen)
|
|
return;
|
|
|
|
if ((dflags & DEL_WARNSTOPPED) && subshell_environment == 0 && STOPPED (job_index))
|
|
internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp);
|
|
temp = jobs[job_index];
|
|
if (temp == 0)
|
|
return;
|
|
|
|
if ((dflags & DEL_NOBGPID) == 0)
|
|
{
|
|
proc = find_last_proc (job_index, 0);
|
|
/* Could do this just for J_ASYNC jobs, but we save all. */
|
|
if (proc)
|
|
bgp_add (proc->pid, process_exit_status (proc->status));
|
|
}
|
|
|
|
jobs[job_index] = (JOB *)NULL;
|
|
if (temp == js.j_lastmade)
|
|
js.j_lastmade = 0;
|
|
else if (temp == js.j_lastasync)
|
|
js.j_lastasync = 0;
|
|
|
|
free (temp->wd);
|
|
ndel = discard_pipeline (temp->pipe);
|
|
|
|
js.c_injobs -= ndel;
|
|
if (temp->state == JDEAD)
|
|
{
|
|
js.c_reaped -= ndel;
|
|
js.j_ndead--;
|
|
if (js.c_reaped < 0)
|
|
{
|
|
#ifdef DEBUG
|
|
itrace("delete_job (%d pgrp %d): js.c_reaped (%d) < 0 ndel = %d js.j_ndead = %d", job_index, temp->pgrp, js.c_reaped, ndel, js.j_ndead);
|
|
#endif
|
|
js.c_reaped = 0;
|
|
}
|
|
}
|
|
|
|
if (temp->deferred)
|
|
dispose_command (temp->deferred);
|
|
|
|
free (temp);
|
|
|
|
js.j_njobs--;
|
|
if (js.j_njobs == 0)
|
|
js.j_firstj = js.j_lastj = 0;
|
|
else if (jobs[js.j_firstj] == 0 || jobs[js.j_lastj] == 0)
|
|
reset_job_indices ();
|
|
|
|
if (job_index == js.j_current || job_index == js.j_previous)
|
|
reset_current ();
|
|
}
|
|
|
|
/* Must be called with SIGCHLD blocked. */
|
|
void
|
|
nohup_job (job_index)
|
|
int job_index;
|
|
{
|
|
register JOB *temp;
|
|
|
|
if (js.j_jobslots == 0)
|
|
return;
|
|
|
|
if (temp = jobs[job_index])
|
|
temp->flags |= J_NOHUP;
|
|
}
|
|
|
|
/* Get rid of the data structure associated with a process chain. */
|
|
static int
|
|
discard_pipeline (chain)
|
|
register PROCESS *chain;
|
|
{
|
|
register PROCESS *this, *next;
|
|
int n;
|
|
|
|
this = chain;
|
|
n = 0;
|
|
do
|
|
{
|
|
next = this->next;
|
|
FREE (this->command);
|
|
free (this);
|
|
n++;
|
|
this = next;
|
|
}
|
|
while (this != chain);
|
|
|
|
return n;
|
|
}
|
|
|
|
/* Add this process to the chain being built in the_pipeline.
|
|
NAME is the command string that will be exec'ed later.
|
|
PID is the process id of the child. */
|
|
static void
|
|
add_process (name, pid)
|
|
char *name;
|
|
pid_t pid;
|
|
{
|
|
PROCESS *t, *p;
|
|
|
|
#if defined (RECYCLES_PIDS)
|
|
int j;
|
|
p = find_process (pid, 0, &j);
|
|
if (p)
|
|
{
|
|
# ifdef DEBUG
|
|
if (j == NO_JOB)
|
|
internal_warning (_("add_process: process %5ld (%s) in the_pipeline"), (long)p->pid, p->command);
|
|
# endif
|
|
if (PALIVE (p))
|
|
internal_warning (_("add_process: pid %5ld (%s) marked as still alive"), (long)p->pid, p->command);
|
|
p->running = PS_RECYCLED; /* mark as recycled */
|
|
}
|
|
#endif
|
|
|
|
t = (PROCESS *)xmalloc (sizeof (PROCESS));
|
|
t->next = the_pipeline;
|
|
t->pid = pid;
|
|
WSTATUS (t->status) = 0;
|
|
t->running = PS_RUNNING;
|
|
t->command = name;
|
|
the_pipeline = t;
|
|
|
|
if (t->next == 0)
|
|
t->next = t;
|
|
else
|
|
{
|
|
p = t->next;
|
|
while (p->next != t->next)
|
|
p = p->next;
|
|
p->next = t;
|
|
}
|
|
}
|
|
|
|
/* Create a (dummy) PROCESS with NAME, PID, and STATUS, and make it the last
|
|
process in jobs[JID]->pipe. Used by the lastpipe code. */
|
|
void
|
|
append_process (name, pid, status, jid)
|
|
char *name;
|
|
pid_t pid;
|
|
int status;
|
|
int jid;
|
|
{
|
|
PROCESS *t, *p;
|
|
|
|
t = (PROCESS *)xmalloc (sizeof (PROCESS));
|
|
t->next = (PROCESS *)NULL;
|
|
t->pid = pid;
|
|
/* set process exit status using offset discovered by configure */
|
|
t->status = (status & 0xff) << WEXITSTATUS_OFFSET;
|
|
t->running = PS_DONE;
|
|
t->command = name;
|
|
|
|
js.c_reaped++; /* XXX */
|
|
|
|
for (p = jobs[jid]->pipe; p->next != jobs[jid]->pipe; p = p->next)
|
|
;
|
|
p->next = t;
|
|
t->next = jobs[jid]->pipe;
|
|
}
|
|
|
|
#if 0
|
|
/* Take the last job and make it the first job. Must be called with
|
|
SIGCHLD blocked. */
|
|
int
|
|
rotate_the_pipeline ()
|
|
{
|
|
PROCESS *p;
|
|
|
|
if (the_pipeline->next == the_pipeline)
|
|
return;
|
|
for (p = the_pipeline; p->next != the_pipeline; p = p->next)
|
|
;
|
|
the_pipeline = p;
|
|
}
|
|
|
|
/* Reverse the order of the processes in the_pipeline. Must be called with
|
|
SIGCHLD blocked. */
|
|
int
|
|
reverse_the_pipeline ()
|
|
{
|
|
PROCESS *p, *n;
|
|
|
|
if (the_pipeline->next == the_pipeline)
|
|
return;
|
|
|
|
for (p = the_pipeline; p->next != the_pipeline; p = p->next)
|
|
;
|
|
p->next = (PROCESS *)NULL;
|
|
|
|
n = REVERSE_LIST (the_pipeline, PROCESS *);
|
|
|
|
the_pipeline = n;
|
|
for (p = the_pipeline; p->next; p = p->next)
|
|
;
|
|
p->next = the_pipeline;
|
|
}
|
|
#endif
|
|
|
|
/* Map FUNC over the list of jobs. If FUNC returns non-zero,
|
|
then it is time to stop mapping, and that is the return value
|
|
for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
|
|
and INDEX. */
|
|
static int
|
|
map_over_jobs (func, arg1, arg2)
|
|
sh_job_map_func_t *func;
|
|
int arg1, arg2;
|
|
{
|
|
register int i;
|
|
int result;
|
|
sigset_t set, oset;
|
|
|
|
if (js.j_jobslots == 0)
|
|
return 0;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = result = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i])
|
|
{
|
|
result = (*func)(jobs[i], arg1, arg2, i);
|
|
if (result)
|
|
break;
|
|
}
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/* Cause all the jobs in the current pipeline to exit. */
|
|
void
|
|
terminate_current_pipeline ()
|
|
{
|
|
if (pipeline_pgrp && pipeline_pgrp != shell_pgrp)
|
|
{
|
|
killpg (pipeline_pgrp, SIGTERM);
|
|
killpg (pipeline_pgrp, SIGCONT);
|
|
}
|
|
}
|
|
|
|
/* Cause all stopped jobs to exit. */
|
|
void
|
|
terminate_stopped_jobs ()
|
|
{
|
|
register int i;
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
if (jobs[i] && STOPPED (i))
|
|
{
|
|
killpg (jobs[i]->pgrp, SIGTERM);
|
|
killpg (jobs[i]->pgrp, SIGCONT);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Cause all jobs, running or stopped, to receive a hangup signal. If
|
|
a job is marked J_NOHUP, don't send the SIGHUP. */
|
|
void
|
|
hangup_all_jobs ()
|
|
{
|
|
register int i;
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
if (jobs[i])
|
|
{
|
|
if (jobs[i]->flags & J_NOHUP)
|
|
continue;
|
|
killpg (jobs[i]->pgrp, SIGHUP);
|
|
if (STOPPED (i))
|
|
killpg (jobs[i]->pgrp, SIGCONT);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
kill_current_pipeline ()
|
|
{
|
|
stop_making_children ();
|
|
start_pipeline ();
|
|
}
|
|
|
|
/* Return the pipeline that PID belongs to. Note that the pipeline
|
|
doesn't have to belong to a job. Must be called with SIGCHLD blocked.
|
|
If JOBP is non-null, return the index of the job containing PID. */
|
|
static PROCESS *
|
|
find_pipeline (pid, alive_only, jobp)
|
|
pid_t pid;
|
|
int alive_only;
|
|
int *jobp; /* index into jobs list or NO_JOB */
|
|
{
|
|
int job;
|
|
PROCESS *p;
|
|
|
|
/* See if this process is in the pipeline that we are building. */
|
|
if (jobp)
|
|
*jobp = NO_JOB;
|
|
if (the_pipeline)
|
|
{
|
|
p = the_pipeline;
|
|
do
|
|
{
|
|
/* Return it if we found it. Don't ever return a recycled pid. */
|
|
if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
|
|
return (p);
|
|
|
|
p = p->next;
|
|
}
|
|
while (p != the_pipeline);
|
|
}
|
|
|
|
job = find_job (pid, alive_only, &p);
|
|
if (jobp)
|
|
*jobp = job;
|
|
return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe;
|
|
}
|
|
|
|
/* Return the PROCESS * describing PID. If JOBP is non-null return the index
|
|
into the jobs array of the job containing PID. Must be called with
|
|
SIGCHLD blocked. */
|
|
static PROCESS *
|
|
find_process (pid, alive_only, jobp)
|
|
pid_t pid;
|
|
int alive_only;
|
|
int *jobp; /* index into jobs list or NO_JOB */
|
|
{
|
|
PROCESS *p;
|
|
|
|
p = find_pipeline (pid, alive_only, jobp);
|
|
while (p && p->pid != pid)
|
|
p = p->next;
|
|
return p;
|
|
}
|
|
|
|
/* Return the job index that PID belongs to, or NO_JOB if it doesn't
|
|
belong to any job. Must be called with SIGCHLD blocked. */
|
|
static int
|
|
find_job (pid, alive_only, procp)
|
|
pid_t pid;
|
|
int alive_only;
|
|
PROCESS **procp;
|
|
{
|
|
register int i;
|
|
PROCESS *p;
|
|
|
|
/* XXX could use js.j_firstj here, and should check js.j_lastj */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("find_job: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("find_job: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i])
|
|
{
|
|
p = jobs[i]->pipe;
|
|
|
|
do
|
|
{
|
|
if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
|
|
{
|
|
if (procp)
|
|
*procp = p;
|
|
return (i);
|
|
}
|
|
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[i]->pipe);
|
|
}
|
|
}
|
|
|
|
return (NO_JOB);
|
|
}
|
|
|
|
/* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
|
|
required by find_job. */
|
|
int
|
|
get_job_by_pid (pid, block)
|
|
pid_t pid;
|
|
int block;
|
|
{
|
|
int job;
|
|
sigset_t set, oset;
|
|
|
|
if (block)
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
job = find_job (pid, 0, NULL);
|
|
|
|
if (block)
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return job;
|
|
}
|
|
|
|
/* Print descriptive information about the job with leader pid PID. */
|
|
void
|
|
describe_pid (pid)
|
|
pid_t pid;
|
|
{
|
|
int job;
|
|
sigset_t set, oset;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
job = find_job (pid, 0, NULL);
|
|
|
|
if (job != NO_JOB)
|
|
fprintf (stderr, "[%d] %ld\n", job + 1, (long)pid);
|
|
else
|
|
programming_error (_("describe_pid: %ld: no such pid"), (long)pid);
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
static char *
|
|
j_strsignal (s)
|
|
int s;
|
|
{
|
|
char *x;
|
|
|
|
x = strsignal (s);
|
|
if (x == 0)
|
|
{
|
|
x = retcode_name_buffer;
|
|
sprintf (x, _("Signal %d"), s);
|
|
}
|
|
return x;
|
|
}
|
|
|
|
static char *
|
|
printable_job_status (j, p, format)
|
|
int j;
|
|
PROCESS *p;
|
|
int format;
|
|
{
|
|
static char *temp;
|
|
int es;
|
|
|
|
temp = _("Done");
|
|
|
|
if (STOPPED (j) && format == 0)
|
|
{
|
|
if (posixly_correct == 0 || p == 0 || (WIFSTOPPED (p->status) == 0))
|
|
temp = _("Stopped");
|
|
else
|
|
{
|
|
temp = retcode_name_buffer;
|
|
sprintf (temp, _("Stopped(%s)"), signal_name (WSTOPSIG (p->status)));
|
|
}
|
|
}
|
|
else if (RUNNING (j))
|
|
temp = _("Running");
|
|
else
|
|
{
|
|
if (WIFSTOPPED (p->status))
|
|
temp = j_strsignal (WSTOPSIG (p->status));
|
|
else if (WIFSIGNALED (p->status))
|
|
temp = j_strsignal (WTERMSIG (p->status));
|
|
else if (WIFEXITED (p->status))
|
|
{
|
|
temp = retcode_name_buffer;
|
|
es = WEXITSTATUS (p->status);
|
|
if (es == 0)
|
|
strcpy (temp, _("Done"));
|
|
else if (posixly_correct)
|
|
sprintf (temp, _("Done(%d)"), es);
|
|
else
|
|
sprintf (temp, _("Exit %d"), es);
|
|
}
|
|
else
|
|
temp = _("Unknown status");
|
|
}
|
|
|
|
return temp;
|
|
}
|
|
|
|
/* This is the way to print out information on a job if you
|
|
know the index. FORMAT is:
|
|
|
|
JLIST_NORMAL) [1]+ Running emacs
|
|
JLIST_LONG ) [1]+ 2378 Running emacs
|
|
-1 ) [1]+ 2378 emacs
|
|
|
|
JLIST_NORMAL) [1]+ Stopped ls | more
|
|
JLIST_LONG ) [1]+ 2369 Stopped ls
|
|
2367 | more
|
|
JLIST_PID_ONLY)
|
|
Just list the pid of the process group leader (really
|
|
the process group).
|
|
JLIST_CHANGED_ONLY)
|
|
Use format JLIST_NORMAL, but list only jobs about which
|
|
the user has not been notified. */
|
|
|
|
/* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
|
|
the JOBS array corresponding to this pipeline. FORMAT is as described
|
|
above. Must be called with SIGCHLD blocked.
|
|
|
|
If you're printing a pipeline that's not in the jobs array, like the
|
|
current pipeline as it's being created, pass -1 for JOB_INDEX */
|
|
static void
|
|
print_pipeline (p, job_index, format, stream)
|
|
PROCESS *p;
|
|
int job_index, format;
|
|
FILE *stream;
|
|
{
|
|
PROCESS *first, *last, *show;
|
|
int es, name_padding;
|
|
char *temp;
|
|
|
|
if (p == 0)
|
|
return;
|
|
|
|
first = last = p;
|
|
while (last->next != first)
|
|
last = last->next;
|
|
|
|
for (;;)
|
|
{
|
|
if (p != first)
|
|
fprintf (stream, format ? " " : " |");
|
|
|
|
if (format != JLIST_STANDARD)
|
|
fprintf (stream, "%5ld", (long)p->pid);
|
|
|
|
fprintf (stream, " ");
|
|
|
|
if (format > -1 && job_index >= 0)
|
|
{
|
|
show = format ? p : last;
|
|
temp = printable_job_status (job_index, show, format);
|
|
|
|
if (p != first)
|
|
{
|
|
if (format)
|
|
{
|
|
if (show->running == first->running &&
|
|
WSTATUS (show->status) == WSTATUS (first->status))
|
|
temp = "";
|
|
}
|
|
else
|
|
temp = (char *)NULL;
|
|
}
|
|
|
|
if (temp)
|
|
{
|
|
fprintf (stream, "%s", temp);
|
|
|
|
es = STRLEN (temp);
|
|
if (es == 0)
|
|
es = 2; /* strlen ("| ") */
|
|
name_padding = LONGEST_SIGNAL_DESC - es;
|
|
|
|
fprintf (stream, "%*s", name_padding, "");
|
|
|
|
if ((WIFSTOPPED (show->status) == 0) &&
|
|
(WIFCONTINUED (show->status) == 0) &&
|
|
WIFCORED (show->status))
|
|
fprintf (stream, _("(core dumped) "));
|
|
}
|
|
}
|
|
|
|
if (p != first && format)
|
|
fprintf (stream, "| ");
|
|
|
|
if (p->command)
|
|
fprintf (stream, "%s", p->command);
|
|
|
|
if (p == last && job_index >= 0)
|
|
{
|
|
temp = current_working_directory ();
|
|
|
|
if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0))
|
|
fprintf (stream, " &");
|
|
|
|
if (strcmp (temp, jobs[job_index]->wd) != 0)
|
|
fprintf (stream,
|
|
_(" (wd: %s)"), polite_directory_format (jobs[job_index]->wd));
|
|
}
|
|
|
|
if (format || (p == last))
|
|
{
|
|
/* We need to add a CR only if this is an interactive shell, and
|
|
we're reporting the status of a completed job asynchronously.
|
|
We can't really check whether this particular job is being
|
|
reported asynchronously, so just add the CR if the shell is
|
|
currently interactive and asynchronous notification is enabled. */
|
|
if (asynchronous_notification && interactive)
|
|
fprintf (stream, "\r\n");
|
|
else
|
|
fprintf (stream, "\n");
|
|
}
|
|
|
|
if (p == last)
|
|
break;
|
|
p = p->next;
|
|
}
|
|
fflush (stream);
|
|
}
|
|
|
|
/* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
|
|
Must be called with SIGCHLD blocked or queued with queue_sigchld */
|
|
static void
|
|
pretty_print_job (job_index, format, stream)
|
|
int job_index, format;
|
|
FILE *stream;
|
|
{
|
|
register PROCESS *p;
|
|
|
|
/* Format only pid information about the process group leader? */
|
|
if (format == JLIST_PID_ONLY)
|
|
{
|
|
fprintf (stream, "%ld\n", (long)jobs[job_index]->pipe->pid);
|
|
return;
|
|
}
|
|
|
|
if (format == JLIST_CHANGED_ONLY)
|
|
{
|
|
if (IS_NOTIFIED (job_index))
|
|
return;
|
|
format = JLIST_STANDARD;
|
|
}
|
|
|
|
if (format != JLIST_NONINTERACTIVE)
|
|
fprintf (stream, "[%d]%c ", job_index + 1,
|
|
(job_index == js.j_current) ? '+':
|
|
(job_index == js.j_previous) ? '-' : ' ');
|
|
|
|
if (format == JLIST_NONINTERACTIVE)
|
|
format = JLIST_LONG;
|
|
|
|
p = jobs[job_index]->pipe;
|
|
|
|
print_pipeline (p, job_index, format, stream);
|
|
|
|
/* We have printed information about this job. When the job's
|
|
status changes, waitchld () sets the notification flag to 0. */
|
|
jobs[job_index]->flags |= J_NOTIFIED;
|
|
}
|
|
|
|
static int
|
|
print_job (job, format, state, job_index)
|
|
JOB *job;
|
|
int format, state, job_index;
|
|
{
|
|
if (state == -1 || (JOB_STATE)state == job->state)
|
|
pretty_print_job (job_index, format, stdout);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
list_one_job (job, format, ignore, job_index)
|
|
JOB *job;
|
|
int format, ignore, job_index;
|
|
{
|
|
pretty_print_job (job_index, format, stdout);
|
|
}
|
|
|
|
void
|
|
list_stopped_jobs (format)
|
|
int format;
|
|
{
|
|
cleanup_dead_jobs ();
|
|
map_over_jobs (print_job, format, (int)JSTOPPED);
|
|
}
|
|
|
|
void
|
|
list_running_jobs (format)
|
|
int format;
|
|
{
|
|
cleanup_dead_jobs ();
|
|
map_over_jobs (print_job, format, (int)JRUNNING);
|
|
}
|
|
|
|
/* List jobs. If FORMAT is non-zero, then the long form of the information
|
|
is printed, else just a short version. */
|
|
void
|
|
list_all_jobs (format)
|
|
int format;
|
|
{
|
|
cleanup_dead_jobs ();
|
|
map_over_jobs (print_job, format, -1);
|
|
}
|
|
|
|
/* Fork, handling errors. Returns the pid of the newly made child, or 0.
|
|
COMMAND is just for remembering the name of the command; we don't do
|
|
anything else with it. ASYNC_P says what to do with the tty. If
|
|
non-zero, then don't give it away. */
|
|
pid_t
|
|
make_child (command, async_p)
|
|
char *command;
|
|
int async_p;
|
|
{
|
|
int forksleep;
|
|
sigset_t set, oset;
|
|
pid_t pid;
|
|
|
|
/* XXX - block SIGTERM here and unblock in child after fork resets the
|
|
set of pending signals? */
|
|
sigemptyset (&set);
|
|
sigaddset (&set, SIGCHLD);
|
|
sigaddset (&set, SIGINT);
|
|
sigemptyset (&oset);
|
|
sigprocmask (SIG_BLOCK, &set, &oset);
|
|
|
|
making_children ();
|
|
|
|
forksleep = 1;
|
|
|
|
#if defined (BUFFERED_INPUT)
|
|
/* If default_buffered_input is active, we are reading a script. If
|
|
the command is asynchronous, we have already duplicated /dev/null
|
|
as fd 0, but have not changed the buffered stream corresponding to
|
|
the old fd 0. We don't want to sync the stream in this case. */
|
|
if (default_buffered_input != -1 &&
|
|
(!async_p || default_buffered_input > 0))
|
|
sync_buffered_stream (default_buffered_input);
|
|
#endif /* BUFFERED_INPUT */
|
|
|
|
RESET_SIGTERM;
|
|
|
|
/* Create the child, handle severe errors. Retry on EAGAIN. */
|
|
while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX)
|
|
{
|
|
/* bash-4.2 */
|
|
/* If we can't create any children, try to reap some dead ones. */
|
|
waitchld (-1, 0);
|
|
|
|
sys_error ("fork: retry");
|
|
RESET_SIGTERM;
|
|
|
|
if (sleep (forksleep) != 0)
|
|
break;
|
|
forksleep <<= 1;
|
|
}
|
|
|
|
if (pid != 0)
|
|
RESET_SIGTERM;
|
|
|
|
if (pid < 0)
|
|
{
|
|
sys_error ("fork");
|
|
|
|
/* Kill all of the processes in the current pipeline. */
|
|
terminate_current_pipeline ();
|
|
|
|
/* Discard the current pipeline, if any. */
|
|
if (the_pipeline)
|
|
kill_current_pipeline ();
|
|
|
|
last_command_exit_value = EX_NOEXEC;
|
|
throw_to_top_level (); /* Reset signals, etc. */
|
|
}
|
|
|
|
if (pid == 0)
|
|
{
|
|
/* In the child. Give this child the right process group, set the
|
|
signals to the default state for a new process. */
|
|
pid_t mypid;
|
|
|
|
mypid = getpid ();
|
|
#if defined (BUFFERED_INPUT)
|
|
/* Close default_buffered_input if it's > 0. We don't close it if it's
|
|
0 because that's the file descriptor used when redirecting input,
|
|
and it's wrong to close the file in that case. */
|
|
unset_bash_input (0);
|
|
#endif /* BUFFERED_INPUT */
|
|
|
|
/* Restore top-level signal mask. */
|
|
sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
|
|
|
|
if (job_control)
|
|
{
|
|
/* All processes in this pipeline belong in the same
|
|
process group. */
|
|
|
|
if (pipeline_pgrp == 0) /* This is the first child. */
|
|
pipeline_pgrp = mypid;
|
|
|
|
/* Check for running command in backquotes. */
|
|
if (pipeline_pgrp == shell_pgrp)
|
|
ignore_tty_job_signals ();
|
|
else
|
|
default_tty_job_signals ();
|
|
|
|
/* Set the process group before trying to mess with the terminal's
|
|
process group. This is mandated by POSIX. */
|
|
/* This is in accordance with the Posix 1003.1 standard,
|
|
section B.7.2.4, which says that trying to set the terminal
|
|
process group with tcsetpgrp() to an unused pgrp value (like
|
|
this would have for the first child) is an error. Section
|
|
B.4.3.3, p. 237 also covers this, in the context of job control
|
|
shells. */
|
|
if (setpgid (mypid, pipeline_pgrp) < 0)
|
|
sys_error (_("child setpgid (%ld to %ld)"), (long)mypid, (long)pipeline_pgrp);
|
|
|
|
/* By convention (and assumption above), if
|
|
pipeline_pgrp == shell_pgrp, we are making a child for
|
|
command substitution.
|
|
In this case, we don't want to give the terminal to the
|
|
shell's process group (we could be in the middle of a
|
|
pipeline, for example). */
|
|
if (async_p == 0 && pipeline_pgrp != shell_pgrp && ((subshell_environment&SUBSHELL_ASYNC) == 0))
|
|
give_terminal_to (pipeline_pgrp, 0);
|
|
|
|
#if defined (PGRP_PIPE)
|
|
if (pipeline_pgrp == mypid)
|
|
pipe_read (pgrp_pipe);
|
|
#endif
|
|
}
|
|
else /* Without job control... */
|
|
{
|
|
if (pipeline_pgrp == 0)
|
|
pipeline_pgrp = shell_pgrp;
|
|
|
|
/* If these signals are set to SIG_DFL, we encounter the curious
|
|
situation of an interactive ^Z to a running process *working*
|
|
and stopping the process, but being unable to do anything with
|
|
that process to change its state. On the other hand, if they
|
|
are set to SIG_IGN, jobs started from scripts do not stop when
|
|
the shell running the script gets a SIGTSTP and stops. */
|
|
|
|
default_tty_job_signals ();
|
|
}
|
|
|
|
#if defined (PGRP_PIPE)
|
|
/* Release the process group pipe, since our call to setpgid ()
|
|
is done. The last call to sh_closepipe is done in stop_pipeline. */
|
|
sh_closepipe (pgrp_pipe);
|
|
#endif /* PGRP_PIPE */
|
|
|
|
#if 0
|
|
/* Don't set last_asynchronous_pid in the child */
|
|
if (async_p)
|
|
last_asynchronous_pid = mypid; /* XXX */
|
|
else
|
|
#endif
|
|
#if defined (RECYCLES_PIDS)
|
|
if (last_asynchronous_pid == mypid)
|
|
/* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
|
|
last_asynchronous_pid = 1;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* In the parent. Remember the pid of the child just created
|
|
as the proper pgrp if this is the first child. */
|
|
|
|
if (job_control)
|
|
{
|
|
if (pipeline_pgrp == 0)
|
|
{
|
|
pipeline_pgrp = pid;
|
|
/* Don't twiddle terminal pgrps in the parent! This is the bug,
|
|
not the good thing of twiddling them in the child! */
|
|
/* give_terminal_to (pipeline_pgrp, 0); */
|
|
}
|
|
/* This is done on the recommendation of the Rationale section of
|
|
the POSIX 1003.1 standard, where it discusses job control and
|
|
shells. It is done to avoid possible race conditions. (Ref.
|
|
1003.1 Rationale, section B.4.3.3, page 236). */
|
|
setpgid (pid, pipeline_pgrp);
|
|
}
|
|
else
|
|
{
|
|
if (pipeline_pgrp == 0)
|
|
pipeline_pgrp = shell_pgrp;
|
|
}
|
|
|
|
/* Place all processes into the jobs array regardless of the
|
|
state of job_control. */
|
|
add_process (command, pid);
|
|
|
|
if (async_p)
|
|
last_asynchronous_pid = pid;
|
|
#if defined (RECYCLES_PIDS)
|
|
else if (last_asynchronous_pid == pid)
|
|
/* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
|
|
last_asynchronous_pid = 1;
|
|
#endif
|
|
|
|
/* Delete the saved status for any job containing this PID in case it's
|
|
been reused. */
|
|
delete_old_job (pid);
|
|
|
|
/* Perform the check for pid reuse unconditionally. Some systems reuse
|
|
PIDs before giving a process CHILD_MAX/_SC_CHILD_MAX unique ones. */
|
|
bgp_delete (pid); /* new process, discard any saved status */
|
|
|
|
last_made_pid = pid;
|
|
|
|
/* keep stats */
|
|
js.c_totforked++;
|
|
js.c_living++;
|
|
|
|
/* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
|
|
SIGCHLD remains blocked until all commands in the pipeline have been
|
|
created. */
|
|
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
|
|
}
|
|
|
|
return (pid);
|
|
}
|
|
|
|
/* These two functions are called only in child processes. */
|
|
void
|
|
ignore_tty_job_signals ()
|
|
{
|
|
set_signal_handler (SIGTSTP, SIG_IGN);
|
|
set_signal_handler (SIGTTIN, SIG_IGN);
|
|
set_signal_handler (SIGTTOU, SIG_IGN);
|
|
}
|
|
|
|
void
|
|
default_tty_job_signals ()
|
|
{
|
|
set_signal_handler (SIGTSTP, SIG_DFL);
|
|
set_signal_handler (SIGTTIN, SIG_DFL);
|
|
set_signal_handler (SIGTTOU, SIG_DFL);
|
|
}
|
|
|
|
/* When we end a job abnormally, or if we stop a job, we set the tty to the
|
|
state kept in here. When a job ends normally, we set the state in here
|
|
to the state of the tty. */
|
|
|
|
static TTYSTRUCT shell_tty_info;
|
|
|
|
#if defined (NEW_TTY_DRIVER)
|
|
static struct tchars shell_tchars;
|
|
static struct ltchars shell_ltchars;
|
|
#endif /* NEW_TTY_DRIVER */
|
|
|
|
#if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
|
|
/* Since the BSD tty driver does not allow us to change the tty modes
|
|
while simultaneously waiting for output to drain and preserving
|
|
typeahead, we have to drain the output ourselves before calling
|
|
ioctl. We cheat by finding the length of the output queue, and
|
|
using select to wait for an appropriate length of time. This is
|
|
a hack, and should be labeled as such (it's a hastily-adapted
|
|
mutation of a `usleep' implementation). It's only reason for
|
|
existing is the flaw in the BSD tty driver. */
|
|
|
|
static int ttspeeds[] =
|
|
{
|
|
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
|
|
1800, 2400, 4800, 9600, 19200, 38400
|
|
};
|
|
|
|
static void
|
|
draino (fd, ospeed)
|
|
int fd, ospeed;
|
|
{
|
|
register int delay = ttspeeds[ospeed];
|
|
int n;
|
|
|
|
if (!delay)
|
|
return;
|
|
|
|
while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n)
|
|
{
|
|
if (n > (delay / 100))
|
|
{
|
|
struct timeval tv;
|
|
|
|
n *= 10; /* 2 bits more for conservativeness. */
|
|
tv.tv_sec = n / delay;
|
|
tv.tv_usec = ((n % delay) * 1000000) / delay;
|
|
select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
#endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
|
|
|
|
/* Return the fd from which we are actually getting input. */
|
|
#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
|
|
|
|
/* Fill the contents of shell_tty_info with the current tty info. */
|
|
int
|
|
get_tty_state ()
|
|
{
|
|
int tty;
|
|
|
|
tty = input_tty ();
|
|
if (tty != -1)
|
|
{
|
|
#if defined (NEW_TTY_DRIVER)
|
|
ioctl (tty, TIOCGETP, &shell_tty_info);
|
|
ioctl (tty, TIOCGETC, &shell_tchars);
|
|
ioctl (tty, TIOCGLTC, &shell_ltchars);
|
|
#endif /* NEW_TTY_DRIVER */
|
|
|
|
#if defined (TERMIO_TTY_DRIVER)
|
|
ioctl (tty, TCGETA, &shell_tty_info);
|
|
#endif /* TERMIO_TTY_DRIVER */
|
|
|
|
#if defined (TERMIOS_TTY_DRIVER)
|
|
if (tcgetattr (tty, &shell_tty_info) < 0)
|
|
{
|
|
#if 0
|
|
/* Only print an error message if we're really interactive at
|
|
this time. */
|
|
if (interactive)
|
|
sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level, tty);
|
|
#endif
|
|
return -1;
|
|
}
|
|
#endif /* TERMIOS_TTY_DRIVER */
|
|
if (check_window_size)
|
|
get_new_window_size (0, (int *)0, (int *)0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Make the current tty use the state in shell_tty_info. */
|
|
int
|
|
set_tty_state ()
|
|
{
|
|
int tty;
|
|
|
|
tty = input_tty ();
|
|
if (tty != -1)
|
|
{
|
|
#if defined (NEW_TTY_DRIVER)
|
|
# if defined (DRAIN_OUTPUT)
|
|
draino (tty, shell_tty_info.sg_ospeed);
|
|
# endif /* DRAIN_OUTPUT */
|
|
ioctl (tty, TIOCSETN, &shell_tty_info);
|
|
ioctl (tty, TIOCSETC, &shell_tchars);
|
|
ioctl (tty, TIOCSLTC, &shell_ltchars);
|
|
#endif /* NEW_TTY_DRIVER */
|
|
|
|
#if defined (TERMIO_TTY_DRIVER)
|
|
ioctl (tty, TCSETAW, &shell_tty_info);
|
|
#endif /* TERMIO_TTY_DRIVER */
|
|
|
|
#if defined (TERMIOS_TTY_DRIVER)
|
|
if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
|
|
{
|
|
/* Only print an error message if we're really interactive at
|
|
this time. */
|
|
if (interactive)
|
|
sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level, tty);
|
|
return -1;
|
|
}
|
|
#endif /* TERMIOS_TTY_DRIVER */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Given an index into the jobs array JOB, return the PROCESS struct of the last
|
|
process in that job's pipeline. This is the one whose exit status
|
|
counts. Must be called with SIGCHLD blocked or queued. */
|
|
static PROCESS *
|
|
find_last_proc (job, block)
|
|
int job;
|
|
int block;
|
|
{
|
|
register PROCESS *p;
|
|
sigset_t set, oset;
|
|
|
|
if (block)
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
p = jobs[job]->pipe;
|
|
while (p && p->next != jobs[job]->pipe)
|
|
p = p->next;
|
|
|
|
if (block)
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return (p);
|
|
}
|
|
|
|
static pid_t
|
|
find_last_pid (job, block)
|
|
int job;
|
|
int block;
|
|
{
|
|
PROCESS *p;
|
|
|
|
p = find_last_proc (job, block);
|
|
/* Possible race condition here. */
|
|
return p->pid;
|
|
}
|
|
|
|
/* Wait for a particular child of the shell to finish executing.
|
|
This low-level function prints an error message if PID is not
|
|
a child of this shell. It returns -1 if it fails, or whatever
|
|
wait_for returns otherwise. If the child is not found in the
|
|
jobs table, it returns 127. */
|
|
int
|
|
wait_for_single_pid (pid)
|
|
pid_t pid;
|
|
{
|
|
register PROCESS *child;
|
|
sigset_t set, oset;
|
|
int r, job;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
child = find_pipeline (pid, 0, (int *)NULL);
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
if (child == 0)
|
|
{
|
|
r = bgp_search (pid);
|
|
if (r >= 0)
|
|
return r;
|
|
}
|
|
|
|
if (child == 0)
|
|
{
|
|
internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
|
|
return (127);
|
|
}
|
|
|
|
r = wait_for (pid);
|
|
|
|
/* POSIX.2: if we just waited for a job, we can remove it from the jobs
|
|
table. */
|
|
BLOCK_CHILD (set, oset);
|
|
job = find_job (pid, 0, NULL);
|
|
if (job != NO_JOB && jobs[job] && DEADJOB (job))
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
/* If running in posix mode, remove the job from the jobs table immediately */
|
|
if (posixly_correct)
|
|
{
|
|
cleanup_dead_jobs ();
|
|
bgp_delete (pid);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Wait for all of the background processes started by this shell to finish. */
|
|
void
|
|
wait_for_background_pids ()
|
|
{
|
|
register int i, r, waited_for;
|
|
sigset_t set, oset;
|
|
pid_t pid;
|
|
|
|
for (waited_for = 0;;)
|
|
{
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* find first running job; if none running in foreground, break */
|
|
/* XXX could use js.j_firstj and js.j_lastj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0)
|
|
break;
|
|
}
|
|
if (i == js.j_jobslots)
|
|
{
|
|
UNBLOCK_CHILD (oset);
|
|
break;
|
|
}
|
|
|
|
/* now wait for the last pid in that job. */
|
|
pid = find_last_pid (i, 0);
|
|
UNBLOCK_CHILD (oset);
|
|
QUIT;
|
|
errno = 0; /* XXX */
|
|
r = wait_for_single_pid (pid);
|
|
if (r == -1)
|
|
{
|
|
/* If we're mistaken about job state, compensate. */
|
|
if (errno == ECHILD)
|
|
mark_all_jobs_as_dead ();
|
|
}
|
|
else
|
|
waited_for++;
|
|
}
|
|
|
|
/* POSIX.2 says the shell can discard the statuses of all completed jobs if
|
|
`wait' is called with no arguments. */
|
|
mark_dead_jobs_as_notified (1);
|
|
cleanup_dead_jobs ();
|
|
bgp_clear ();
|
|
}
|
|
|
|
/* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
|
|
#define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
|
|
static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
|
|
|
|
static int wait_sigint_received;
|
|
static int child_caught_sigint;
|
|
static int waiting_for_child;
|
|
|
|
static void
|
|
restore_sigint_handler ()
|
|
{
|
|
if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
|
|
{
|
|
set_signal_handler (SIGINT, old_sigint_handler);
|
|
old_sigint_handler = INVALID_SIGNAL_HANDLER;
|
|
waiting_for_child = 0;
|
|
}
|
|
}
|
|
|
|
/* Handle SIGINT while we are waiting for children in a script to exit.
|
|
The `wait' builtin should be interruptible, but all others should be
|
|
effectively ignored (i.e. not cause the shell to exit). */
|
|
static sighandler
|
|
wait_sigint_handler (sig)
|
|
int sig;
|
|
{
|
|
SigHandler *sigint_handler;
|
|
|
|
if (interrupt_immediately ||
|
|
(this_shell_builtin && this_shell_builtin == wait_builtin))
|
|
{
|
|
last_command_exit_value = 128+SIGINT;
|
|
restore_sigint_handler ();
|
|
/* If we got a SIGINT while in `wait', and SIGINT is trapped, do
|
|
what POSIX.2 says (see builtins/wait.def for more info). */
|
|
if (this_shell_builtin && this_shell_builtin == wait_builtin &&
|
|
signal_is_trapped (SIGINT) &&
|
|
((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
|
|
{
|
|
trap_handler (SIGINT); /* set pending_traps[SIGINT] */
|
|
wait_signal_received = SIGINT;
|
|
if (interrupt_immediately)
|
|
{
|
|
interrupt_immediately = 0;
|
|
longjmp (wait_intr_buf, 1);
|
|
}
|
|
else
|
|
/* Let CHECK_WAIT_INTR handle it in wait_for/waitchld */
|
|
SIGRETURN (0);
|
|
}
|
|
else if (interrupt_immediately)
|
|
{
|
|
ADDINTERRUPT;
|
|
QUIT;
|
|
}
|
|
else /* wait_builtin but signal not trapped, treat as interrupt */
|
|
kill (getpid (), SIGINT);
|
|
}
|
|
|
|
/* XXX - should this be interrupt_state? If it is, the shell will act
|
|
as if it got the SIGINT interrupt. */
|
|
if (waiting_for_child)
|
|
wait_sigint_received = 1;
|
|
else
|
|
{
|
|
last_command_exit_value = 128+SIGINT;
|
|
restore_sigint_handler ();
|
|
kill (getpid (), SIGINT);
|
|
}
|
|
|
|
/* Otherwise effectively ignore the SIGINT and allow the running job to
|
|
be killed. */
|
|
SIGRETURN (0);
|
|
}
|
|
|
|
static int
|
|
process_exit_signal (status)
|
|
WAIT status;
|
|
{
|
|
return (WIFSIGNALED (status) ? WTERMSIG (status) : 0);
|
|
}
|
|
|
|
static int
|
|
process_exit_status (status)
|
|
WAIT status;
|
|
{
|
|
if (WIFSIGNALED (status))
|
|
return (128 + WTERMSIG (status));
|
|
else if (WIFSTOPPED (status) == 0)
|
|
return (WEXITSTATUS (status));
|
|
else
|
|
return (EXECUTION_SUCCESS);
|
|
}
|
|
|
|
static WAIT
|
|
job_signal_status (job)
|
|
int job;
|
|
{
|
|
register PROCESS *p;
|
|
WAIT s;
|
|
|
|
p = jobs[job]->pipe;
|
|
do
|
|
{
|
|
s = p->status;
|
|
if (WIFSIGNALED(s) || WIFSTOPPED(s))
|
|
break;
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
|
|
return s;
|
|
}
|
|
|
|
/* Return the exit status of the last process in the pipeline for job JOB.
|
|
This is the exit status of the entire job. */
|
|
static WAIT
|
|
raw_job_exit_status (job)
|
|
int job;
|
|
{
|
|
register PROCESS *p;
|
|
int fail;
|
|
WAIT ret;
|
|
|
|
if (pipefail_opt)
|
|
{
|
|
fail = 0;
|
|
p = jobs[job]->pipe;
|
|
do
|
|
{
|
|
if (WSTATUS (p->status) != EXECUTION_SUCCESS)
|
|
fail = WSTATUS(p->status);
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
WSTATUS (ret) = fail;
|
|
return ret;
|
|
}
|
|
|
|
for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next)
|
|
;
|
|
return (p->status);
|
|
}
|
|
|
|
/* Return the exit status of job JOB. This is the exit status of the last
|
|
(rightmost) process in the job's pipeline, modified if the job was killed
|
|
by a signal or stopped. */
|
|
int
|
|
job_exit_status (job)
|
|
int job;
|
|
{
|
|
return (process_exit_status (raw_job_exit_status (job)));
|
|
}
|
|
|
|
int
|
|
job_exit_signal (job)
|
|
int job;
|
|
{
|
|
return (process_exit_signal (raw_job_exit_status (job)));
|
|
}
|
|
|
|
#define FIND_CHILD(pid, child) \
|
|
do \
|
|
{ \
|
|
child = find_pipeline (pid, 0, (int *)NULL); \
|
|
if (child == 0) \
|
|
{ \
|
|
give_terminal_to (shell_pgrp, 0); \
|
|
UNBLOCK_CHILD (oset); \
|
|
internal_error (_("wait_for: No record of process %ld"), (long)pid); \
|
|
restore_sigint_handler (); \
|
|
return (termination_state = 127); \
|
|
} \
|
|
} \
|
|
while (0)
|
|
|
|
/* Wait for pid (one of our children) to terminate, then
|
|
return the termination state. Returns 127 if PID is not found in
|
|
the jobs table. Returns -1 if waitchld() returns -1, indicating
|
|
that there are no unwaited-for child processes. */
|
|
int
|
|
wait_for (pid)
|
|
pid_t pid;
|
|
{
|
|
int job, termination_state, r;
|
|
WAIT s;
|
|
register PROCESS *child;
|
|
sigset_t set, oset;
|
|
|
|
/* In the case that this code is interrupted, and we longjmp () out of it,
|
|
we are relying on the code in throw_to_top_level () to restore the
|
|
top-level signal mask. */
|
|
child = 0;
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* Ignore interrupts while waiting for a job run without job control
|
|
to finish. We don't want the shell to exit if an interrupt is
|
|
received, only if one of the jobs run is killed via SIGINT. If
|
|
job control is not set, the job will be run in the same pgrp as
|
|
the shell, and the shell will see any signals the job gets. In
|
|
fact, we want this set every time the waiting shell and the waited-
|
|
for process are in the same process group, including command
|
|
substitution. */
|
|
|
|
/* This is possibly a race condition -- should it go in stop_pipeline? */
|
|
wait_sigint_received = child_caught_sigint = 0;
|
|
if (job_control == 0 || (subshell_environment&SUBSHELL_COMSUB))
|
|
{
|
|
old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
|
|
waiting_for_child = 0;
|
|
if (old_sigint_handler == SIG_IGN)
|
|
set_signal_handler (SIGINT, old_sigint_handler);
|
|
}
|
|
|
|
termination_state = last_command_exit_value;
|
|
|
|
if (interactive && job_control == 0)
|
|
QUIT;
|
|
/* Check for terminating signals and exit the shell if we receive one */
|
|
CHECK_TERMSIG;
|
|
|
|
/* Check for a trapped signal interrupting the wait builtin and jump out */
|
|
CHECK_WAIT_INTR;
|
|
|
|
/* If we say wait_for (), then we have a record of this child somewhere.
|
|
If it and none of its peers are running, don't call waitchld(). */
|
|
|
|
job = NO_JOB;
|
|
do
|
|
{
|
|
if (pid != ANY_PID)
|
|
FIND_CHILD (pid, child);
|
|
|
|
/* If this child is part of a job, then we are really waiting for the
|
|
job to finish. Otherwise, we are waiting for the child to finish.
|
|
We check for JDEAD in case the job state has been set by waitchld
|
|
after receipt of a SIGCHLD. */
|
|
if (job == NO_JOB)
|
|
job = find_job (pid, 0, NULL);
|
|
|
|
/* waitchld() takes care of setting the state of the job. If the job
|
|
has already exited before this is called, sigchld_handler will have
|
|
called waitchld and the state will be set to JDEAD. */
|
|
|
|
if (pid == ANY_PID || PRUNNING(child) || (job != NO_JOB && RUNNING (job)))
|
|
{
|
|
#if defined (WAITPID_BROKEN) /* SCOv4 */
|
|
sigset_t suspend_set;
|
|
sigemptyset (&suspend_set);
|
|
sigsuspend (&suspend_set);
|
|
#else /* !WAITPID_BROKEN */
|
|
# if defined (MUST_UNBLOCK_CHLD)
|
|
struct sigaction act, oact;
|
|
sigset_t nullset, chldset;
|
|
|
|
sigemptyset (&nullset);
|
|
sigemptyset (&chldset);
|
|
sigprocmask (SIG_SETMASK, &nullset, &chldset);
|
|
act.sa_handler = SIG_DFL;
|
|
sigemptyset (&act.sa_mask);
|
|
sigemptyset (&oact.sa_mask);
|
|
act.sa_flags = 0;
|
|
# if defined (SA_RESTART)
|
|
act.sa_flags |= SA_RESTART;
|
|
# endif
|
|
sigaction (SIGCHLD, &act, &oact);
|
|
# endif /* MUST_UNBLOCK_CHLD */
|
|
queue_sigchld = 1;
|
|
waiting_for_child++;
|
|
r = waitchld (pid, 1); /* XXX */
|
|
waiting_for_child--;
|
|
#if 0
|
|
itrace("wait_for: blocking wait for %d returns %d child = %p", (int)pid, r, child);
|
|
#endif
|
|
# if defined (MUST_UNBLOCK_CHLD)
|
|
sigaction (SIGCHLD, &oact, (struct sigaction *)NULL);
|
|
sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL);
|
|
# endif
|
|
queue_sigchld = 0;
|
|
if (r == -1 && errno == ECHILD && this_shell_builtin == wait_builtin)
|
|
{
|
|
termination_state = -1;
|
|
/* XXX - restore sigint handler here? */
|
|
goto wait_for_return;
|
|
}
|
|
|
|
/* If child is marked as running, but waitpid() returns -1/ECHILD,
|
|
there is something wrong. Somewhere, wait should have returned
|
|
that child's pid. Mark the child as not running and the job,
|
|
if it exists, as JDEAD. */
|
|
if (r == -1 && errno == ECHILD)
|
|
{
|
|
if (child)
|
|
{
|
|
child->running = PS_DONE;
|
|
WSTATUS (child->status) = 0; /* XXX -- can't find true status */
|
|
}
|
|
js.c_living = 0; /* no living child processes */
|
|
if (job != NO_JOB)
|
|
{
|
|
jobs[job]->state = JDEAD;
|
|
js.c_reaped++;
|
|
js.j_ndead++;
|
|
}
|
|
if (pid == ANY_PID)
|
|
{
|
|
termination_state = -1;
|
|
break;
|
|
}
|
|
}
|
|
#endif /* WAITPID_BROKEN */
|
|
}
|
|
|
|
/* If the shell is interactive, and job control is disabled, see
|
|
if the foreground process has died due to SIGINT and jump out
|
|
of the wait loop if it has. waitchld has already restored the
|
|
old SIGINT signal handler. */
|
|
if (interactive && job_control == 0)
|
|
QUIT;
|
|
/* Check for terminating signals and exit the shell if we receive one */
|
|
CHECK_TERMSIG;
|
|
|
|
/* Check for a trapped signal interrupting the wait builtin and jump out */
|
|
CHECK_WAIT_INTR;
|
|
|
|
if (pid == ANY_PID)
|
|
/* XXX - could set child but we don't have a handle on what waitchld
|
|
reaps. Leave termination_state alone. */
|
|
goto wait_for_return;
|
|
}
|
|
while (PRUNNING (child) || (job != NO_JOB && RUNNING (job)));
|
|
|
|
/* Restore the original SIGINT signal handler before we return. */
|
|
restore_sigint_handler ();
|
|
|
|
/* The exit state of the command is either the termination state of the
|
|
child, or the termination state of the job. If a job, the status
|
|
of the last child in the pipeline is the significant one. If the command
|
|
or job was terminated by a signal, note that value also. */
|
|
termination_state = (job != NO_JOB) ? job_exit_status (job)
|
|
: process_exit_status (child->status);
|
|
last_command_exit_signal = (job != NO_JOB) ? job_exit_signal (job)
|
|
: process_exit_signal (child->status);
|
|
|
|
/* XXX */
|
|
if ((job != NO_JOB && JOBSTATE (job) == JSTOPPED) || WIFSTOPPED (child->status))
|
|
termination_state = 128 + WSTOPSIG (child->status);
|
|
|
|
if (job == NO_JOB || IS_JOBCONTROL (job))
|
|
{
|
|
/* XXX - under what circumstances is a job not present in the jobs
|
|
table (job == NO_JOB)?
|
|
1. command substitution
|
|
|
|
In the case of command substitution, at least, it's probably not
|
|
the right thing to give the terminal to the shell's process group,
|
|
even though there is code in subst.c:command_substitute to work
|
|
around it.
|
|
|
|
Things that don't:
|
|
$PROMPT_COMMAND execution
|
|
process substitution
|
|
*/
|
|
#if 0
|
|
if (job == NO_JOB)
|
|
itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp);
|
|
#endif
|
|
give_terminal_to (shell_pgrp, 0);
|
|
}
|
|
|
|
/* If the command did not exit cleanly, or the job is just
|
|
being stopped, then reset the tty state back to what it
|
|
was before this command. Reset the tty state and notify
|
|
the user of the job termination only if the shell is
|
|
interactive. Clean up any dead jobs in either case. */
|
|
if (job != NO_JOB)
|
|
{
|
|
if (interactive_shell && subshell_environment == 0)
|
|
{
|
|
/* This used to use `child->status'. That's wrong, however, for
|
|
pipelines. `child' is the first process in the pipeline. It's
|
|
likely that the process we want to check for abnormal termination
|
|
or stopping is the last process in the pipeline, especially if
|
|
it's long-lived and the first process is short-lived. Since we
|
|
know we have a job here, we can check all the processes in this
|
|
job's pipeline and see if one of them stopped or terminated due
|
|
to a signal. We might want to change this later to just check
|
|
the last process in the pipeline. If no process exits due to a
|
|
signal, S is left as the status of the last job in the pipeline. */
|
|
s = job_signal_status (job);
|
|
|
|
if (WIFSIGNALED (s) || WIFSTOPPED (s))
|
|
{
|
|
set_tty_state ();
|
|
|
|
/* If the current job was stopped or killed by a signal, and
|
|
the user has requested it, get a possibly new window size */
|
|
if (check_window_size && (job == js.j_current || IS_FOREGROUND (job)))
|
|
get_new_window_size (0, (int *)0, (int *)0);
|
|
}
|
|
else
|
|
get_tty_state ();
|
|
|
|
/* If job control is enabled, the job was started with job
|
|
control, the job was the foreground job, and it was killed
|
|
by SIGINT, then print a newline to compensate for the kernel
|
|
printing the ^C without a trailing newline. */
|
|
if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) &&
|
|
WIFSIGNALED (s) && WTERMSIG (s) == SIGINT)
|
|
{
|
|
/* If SIGINT is not trapped and the shell is in a for, while,
|
|
or until loop, act as if the shell received SIGINT as
|
|
well, so the loop can be broken. This doesn't call the
|
|
SIGINT signal handler; maybe it should. */
|
|
if (signal_is_trapped (SIGINT) == 0 && (loop_level || (shell_compatibility_level > 32 && executing_list)))
|
|
ADDINTERRUPT;
|
|
else
|
|
{
|
|
putchar ('\n');
|
|
fflush (stdout);
|
|
}
|
|
}
|
|
}
|
|
else if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PIPE)) && wait_sigint_received)
|
|
{
|
|
/* If waiting for a job in a subshell started to do command
|
|
substitution or to run a pipeline element that consists of
|
|
something like a while loop or a for loop, simulate getting
|
|
and being killed by the SIGINT to pass the status back to our
|
|
parent. */
|
|
s = job_signal_status (job);
|
|
|
|
if (child_caught_sigint == 0 && signal_is_trapped (SIGINT) == 0)
|
|
{
|
|
UNBLOCK_CHILD (oset);
|
|
old_sigint_handler = set_signal_handler (SIGINT, SIG_DFL);
|
|
if (old_sigint_handler == SIG_IGN)
|
|
restore_sigint_handler ();
|
|
else
|
|
kill (getpid (), SIGINT);
|
|
}
|
|
}
|
|
else if (interactive_shell == 0 && IS_FOREGROUND (job) && check_window_size)
|
|
get_new_window_size (0, (int *)0, (int *)0);
|
|
|
|
/* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
|
|
signal handler path */
|
|
if (DEADJOB (job) && IS_FOREGROUND (job) /*&& subshell_environment == 0*/)
|
|
setjstatus (job);
|
|
|
|
/* If this job is dead, notify the user of the status. If the shell
|
|
is interactive, this will display a message on the terminal. If
|
|
the shell is not interactive, make sure we turn on the notify bit
|
|
so we don't get an unwanted message about the job's termination,
|
|
and so delete_job really clears the slot in the jobs table. */
|
|
notify_and_cleanup ();
|
|
}
|
|
|
|
wait_for_return:
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return (termination_state);
|
|
}
|
|
|
|
/* Wait for the last process in the pipeline for JOB. Returns whatever
|
|
wait_for returns: the last process's termination state or -1 if there
|
|
are no unwaited-for child processes or an error occurs. */
|
|
int
|
|
wait_for_job (job)
|
|
int job;
|
|
{
|
|
pid_t pid;
|
|
int r;
|
|
sigset_t set, oset;
|
|
|
|
BLOCK_CHILD(set, oset);
|
|
if (JOBSTATE (job) == JSTOPPED)
|
|
internal_warning (_("wait_for_job: job %d is stopped"), job+1);
|
|
|
|
pid = find_last_pid (job, 0);
|
|
UNBLOCK_CHILD(oset);
|
|
r = wait_for (pid);
|
|
|
|
/* POSIX.2: we can remove the job from the jobs table if we just waited
|
|
for it. */
|
|
BLOCK_CHILD (set, oset);
|
|
if (job != NO_JOB && jobs[job] && DEADJOB (job))
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Wait for any background job started by this shell to finish. Very
|
|
similar to wait_for_background_pids(). Returns the exit status of
|
|
the next exiting job, -1 if there are no background jobs. The caller
|
|
is responsible for translating -1 into the right return value. */
|
|
int
|
|
wait_for_any_job ()
|
|
{
|
|
pid_t pid;
|
|
int i, r, waited_for;
|
|
sigset_t set, oset;
|
|
|
|
if (jobs_list_frozen)
|
|
return -1;
|
|
|
|
/* First see if there are any unnotified dead jobs that we can report on */
|
|
BLOCK_CHILD (set, oset);
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i) == 0)
|
|
{
|
|
return_job:
|
|
r = job_exit_status (i);
|
|
notify_of_job_status (); /* XXX */
|
|
delete_job (i, 0);
|
|
#if defined (COPROCESS_SUPPORT)
|
|
coproc_reap ();
|
|
#endif
|
|
UNBLOCK_CHILD (oset);
|
|
return r;
|
|
}
|
|
}
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
/* At this point, we have no dead jobs in the jobs table. Wait until we
|
|
get one, even if it takes multiple pids exiting. */
|
|
for (waited_for = 0;;)
|
|
{
|
|
/* Make sure there is a background job to wait for */
|
|
BLOCK_CHILD (set, oset);
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0)
|
|
break;
|
|
if (i == js.j_jobslots)
|
|
{
|
|
UNBLOCK_CHILD (oset);
|
|
return -1;
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
QUIT;
|
|
CHECK_TERMSIG;
|
|
CHECK_WAIT_INTR;
|
|
|
|
errno = 0;
|
|
r = wait_for (ANY_PID); /* special sentinel value for wait_for */
|
|
if (r == -1 && errno == ECHILD)
|
|
mark_all_jobs_as_dead ();
|
|
|
|
/* Now we see if we have any dead jobs and return the first one */
|
|
BLOCK_CHILD (set, oset);
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
if (jobs[i] && DEADJOB (i))
|
|
goto return_job;
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Print info about dead jobs, and then delete them from the list
|
|
of known jobs. This does not actually delete jobs when the
|
|
shell is not interactive, because the dead jobs are not marked
|
|
as notified. */
|
|
void
|
|
notify_and_cleanup ()
|
|
{
|
|
if (jobs_list_frozen)
|
|
return;
|
|
|
|
if (interactive || interactive_shell == 0 || sourcelevel)
|
|
notify_of_job_status ();
|
|
|
|
cleanup_dead_jobs ();
|
|
}
|
|
|
|
/* Make dead jobs disappear from the jobs array without notification.
|
|
This is used when the shell is not interactive. */
|
|
void
|
|
reap_dead_jobs ()
|
|
{
|
|
mark_dead_jobs_as_notified (0);
|
|
cleanup_dead_jobs ();
|
|
}
|
|
|
|
/* Return the next closest (chronologically) job to JOB which is in
|
|
STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
|
|
there is no next recent job. */
|
|
static int
|
|
most_recent_job_in_state (job, state)
|
|
int job;
|
|
JOB_STATE state;
|
|
{
|
|
register int i, result;
|
|
sigset_t set, oset;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
for (result = NO_JOB, i = job - 1; i >= 0; i--)
|
|
{
|
|
if (jobs[i] && (JOBSTATE (i) == state))
|
|
{
|
|
result = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/* Return the newest *stopped* job older than JOB, or NO_JOB if not
|
|
found. */
|
|
static int
|
|
job_last_stopped (job)
|
|
int job;
|
|
{
|
|
return (most_recent_job_in_state (job, JSTOPPED));
|
|
}
|
|
|
|
/* Return the newest *running* job older than JOB, or NO_JOB if not
|
|
found. */
|
|
static int
|
|
job_last_running (job)
|
|
int job;
|
|
{
|
|
return (most_recent_job_in_state (job, JRUNNING));
|
|
}
|
|
|
|
/* Make JOB be the current job, and make previous be useful. Must be
|
|
called with SIGCHLD blocked. */
|
|
static void
|
|
set_current_job (job)
|
|
int job;
|
|
{
|
|
int candidate;
|
|
|
|
if (js.j_current != job)
|
|
{
|
|
js.j_previous = js.j_current;
|
|
js.j_current = job;
|
|
}
|
|
|
|
/* First choice for previous job is the old current job. */
|
|
if (js.j_previous != js.j_current &&
|
|
js.j_previous != NO_JOB &&
|
|
jobs[js.j_previous] &&
|
|
STOPPED (js.j_previous))
|
|
return;
|
|
|
|
/* Second choice: Newest stopped job that is older than
|
|
the current job. */
|
|
candidate = NO_JOB;
|
|
if (STOPPED (js.j_current))
|
|
{
|
|
candidate = job_last_stopped (js.j_current);
|
|
|
|
if (candidate != NO_JOB)
|
|
{
|
|
js.j_previous = candidate;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* If we get here, there is either only one stopped job, in which case it is
|
|
the current job and the previous job should be set to the newest running
|
|
job, or there are only running jobs and the previous job should be set to
|
|
the newest running job older than the current job. We decide on which
|
|
alternative to use based on whether or not JOBSTATE(js.j_current) is
|
|
JSTOPPED. */
|
|
|
|
candidate = RUNNING (js.j_current) ? job_last_running (js.j_current)
|
|
: job_last_running (js.j_jobslots);
|
|
|
|
if (candidate != NO_JOB)
|
|
{
|
|
js.j_previous = candidate;
|
|
return;
|
|
}
|
|
|
|
/* There is only a single job, and it is both `+' and `-'. */
|
|
js.j_previous = js.j_current;
|
|
}
|
|
|
|
/* Make current_job be something useful, if it isn't already. */
|
|
|
|
/* Here's the deal: The newest non-running job should be `+', and the
|
|
next-newest non-running job should be `-'. If there is only a single
|
|
stopped job, the js.j_previous is the newest non-running job. If there
|
|
are only running jobs, the newest running job is `+' and the
|
|
next-newest running job is `-'. Must be called with SIGCHLD blocked. */
|
|
|
|
static void
|
|
reset_current ()
|
|
{
|
|
int candidate;
|
|
|
|
if (js.j_jobslots && js.j_current != NO_JOB && jobs[js.j_current] && STOPPED (js.j_current))
|
|
candidate = js.j_current;
|
|
else
|
|
{
|
|
candidate = NO_JOB;
|
|
|
|
/* First choice: the previous job. */
|
|
if (js.j_previous != NO_JOB && jobs[js.j_previous] && STOPPED (js.j_previous))
|
|
candidate = js.j_previous;
|
|
|
|
/* Second choice: the most recently stopped job. */
|
|
if (candidate == NO_JOB)
|
|
candidate = job_last_stopped (js.j_jobslots);
|
|
|
|
/* Third choice: the newest running job. */
|
|
if (candidate == NO_JOB)
|
|
candidate = job_last_running (js.j_jobslots);
|
|
}
|
|
|
|
/* If we found a job to use, then use it. Otherwise, there
|
|
are no jobs period. */
|
|
if (candidate != NO_JOB)
|
|
set_current_job (candidate);
|
|
else
|
|
js.j_current = js.j_previous = NO_JOB;
|
|
}
|
|
|
|
/* Set up the job structures so we know the job and its processes are
|
|
all running. */
|
|
static void
|
|
set_job_running (job)
|
|
int job;
|
|
{
|
|
register PROCESS *p;
|
|
|
|
/* Each member of the pipeline is now running. */
|
|
p = jobs[job]->pipe;
|
|
|
|
do
|
|
{
|
|
if (WIFSTOPPED (p->status))
|
|
p->running = PS_RUNNING; /* XXX - could be PS_STOPPED */
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
|
|
/* This means that the job is running. */
|
|
JOBSTATE (job) = JRUNNING;
|
|
}
|
|
|
|
/* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
|
|
start the job in the background. JOB is a zero-based index into
|
|
JOBS. Returns -1 if it is unable to start a job, and the return
|
|
status of the job otherwise. */
|
|
int
|
|
start_job (job, foreground)
|
|
int job, foreground;
|
|
{
|
|
register PROCESS *p;
|
|
int already_running;
|
|
sigset_t set, oset;
|
|
char *wd, *s;
|
|
static TTYSTRUCT save_stty;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
if (DEADJOB (job))
|
|
{
|
|
internal_error (_("%s: job has terminated"), this_command_name);
|
|
UNBLOCK_CHILD (oset);
|
|
return (-1);
|
|
}
|
|
|
|
already_running = RUNNING (job);
|
|
|
|
if (foreground == 0 && already_running)
|
|
{
|
|
internal_error (_("%s: job %d already in background"), this_command_name, job + 1);
|
|
UNBLOCK_CHILD (oset);
|
|
return (0); /* XPG6/SUSv3 says this is not an error */
|
|
}
|
|
|
|
wd = current_working_directory ();
|
|
|
|
/* You don't know about the state of this job. Do you? */
|
|
jobs[job]->flags &= ~J_NOTIFIED;
|
|
|
|
if (foreground)
|
|
{
|
|
set_current_job (job);
|
|
jobs[job]->flags |= J_FOREGROUND;
|
|
}
|
|
|
|
/* Tell the outside world what we're doing. */
|
|
p = jobs[job]->pipe;
|
|
|
|
if (foreground == 0)
|
|
{
|
|
/* POSIX.2 says `bg' doesn't give any indication about current or
|
|
previous job. */
|
|
if (posixly_correct == 0)
|
|
s = (job == js.j_current) ? "+ ": ((job == js.j_previous) ? "- " : " ");
|
|
else
|
|
s = " ";
|
|
printf ("[%d]%s", job + 1, s);
|
|
}
|
|
|
|
do
|
|
{
|
|
printf ("%s%s",
|
|
p->command ? p->command : "",
|
|
p->next != jobs[job]->pipe? " | " : "");
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
|
|
if (foreground == 0)
|
|
printf (" &");
|
|
|
|
if (strcmp (wd, jobs[job]->wd) != 0)
|
|
printf (" (wd: %s)", polite_directory_format (jobs[job]->wd));
|
|
|
|
printf ("\n");
|
|
|
|
/* Run the job. */
|
|
if (already_running == 0)
|
|
set_job_running (job);
|
|
|
|
/* Save the tty settings before we start the job in the foreground. */
|
|
if (foreground)
|
|
{
|
|
get_tty_state ();
|
|
save_stty = shell_tty_info;
|
|
/* Give the terminal to this job. */
|
|
if (IS_JOBCONTROL (job))
|
|
give_terminal_to (jobs[job]->pgrp, 0);
|
|
}
|
|
else
|
|
jobs[job]->flags &= ~J_FOREGROUND;
|
|
|
|
/* If the job is already running, then don't bother jump-starting it. */
|
|
if (already_running == 0)
|
|
{
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
killpg (jobs[job]->pgrp, SIGCONT);
|
|
}
|
|
|
|
if (foreground)
|
|
{
|
|
pid_t pid;
|
|
int st;
|
|
|
|
pid = find_last_pid (job, 0);
|
|
UNBLOCK_CHILD (oset);
|
|
st = wait_for (pid);
|
|
shell_tty_info = save_stty;
|
|
set_tty_state ();
|
|
return (st);
|
|
}
|
|
else
|
|
{
|
|
reset_current ();
|
|
UNBLOCK_CHILD (oset);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/* Give PID SIGNAL. This determines what job the pid belongs to (if any).
|
|
If PID does belong to a job, and the job is stopped, then CONTinue the
|
|
job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
|
|
then kill the process group associated with PID. */
|
|
int
|
|
kill_pid (pid, sig, group)
|
|
pid_t pid;
|
|
int sig, group;
|
|
{
|
|
register PROCESS *p;
|
|
int job, result, negative;
|
|
sigset_t set, oset;
|
|
|
|
if (pid < -1)
|
|
{
|
|
pid = -pid;
|
|
group = negative = 1;
|
|
}
|
|
else
|
|
negative = 0;
|
|
|
|
result = EXECUTION_SUCCESS;
|
|
if (group)
|
|
{
|
|
BLOCK_CHILD (set, oset);
|
|
p = find_pipeline (pid, 0, &job);
|
|
|
|
if (job != NO_JOB)
|
|
{
|
|
jobs[job]->flags &= ~J_NOTIFIED;
|
|
|
|
/* Kill process in backquotes or one started without job control? */
|
|
|
|
/* If we're passed a pid < -1, just call killpg and see what happens */
|
|
if (negative && jobs[job]->pgrp == shell_pgrp)
|
|
result = killpg (pid, sig);
|
|
/* If we're killing using job control notification, for example,
|
|
without job control active, we have to do things ourselves. */
|
|
else if (jobs[job]->pgrp == shell_pgrp)
|
|
{
|
|
p = jobs[job]->pipe;
|
|
do
|
|
{
|
|
if (PALIVE (p) == 0)
|
|
continue; /* avoid pid recycling problem */
|
|
kill (p->pid, sig);
|
|
if (PEXITED (p) && (sig == SIGTERM || sig == SIGHUP))
|
|
kill (p->pid, SIGCONT);
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[job]->pipe);
|
|
}
|
|
else
|
|
{
|
|
result = killpg (jobs[job]->pgrp, sig);
|
|
if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP))
|
|
killpg (jobs[job]->pgrp, SIGCONT);
|
|
/* If we're continuing a stopped job via kill rather than bg or
|
|
fg, emulate the `bg' behavior. */
|
|
if (p && STOPPED (job) && (sig == SIGCONT))
|
|
{
|
|
set_job_running (job);
|
|
jobs[job]->flags &= ~J_FOREGROUND;
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
result = killpg (pid, sig);
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
else
|
|
result = kill (pid, sig);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/* sigchld_handler () flushes at least one of the children that we are
|
|
waiting for. It gets run when we have gotten a SIGCHLD signal. */
|
|
static sighandler
|
|
sigchld_handler (sig)
|
|
int sig;
|
|
{
|
|
int n, oerrno;
|
|
|
|
oerrno = errno;
|
|
REINSTALL_SIGCHLD_HANDLER;
|
|
sigchld++;
|
|
n = 0;
|
|
if (queue_sigchld == 0)
|
|
n = waitchld (-1, 0);
|
|
errno = oerrno;
|
|
SIGRETURN (n);
|
|
}
|
|
|
|
/* waitchld() reaps dead or stopped children. It's called by wait_for and
|
|
sigchld_handler, and runs until there aren't any children terminating any
|
|
more.
|
|
If BLOCK is 1, this is to be a blocking wait for a single child, although
|
|
an arriving SIGCHLD could cause the wait to be non-blocking. It returns
|
|
the number of children reaped, or -1 if there are no unwaited-for child
|
|
processes. */
|
|
static int
|
|
waitchld (wpid, block)
|
|
pid_t wpid;
|
|
int block;
|
|
{
|
|
WAIT status;
|
|
PROCESS *child;
|
|
pid_t pid;
|
|
|
|
int call_set_current, last_stopped_job, job, children_exited, waitpid_flags;
|
|
static int wcontinued = WCONTINUED; /* run-time fix for glibc problem */
|
|
|
|
call_set_current = children_exited = 0;
|
|
last_stopped_job = NO_JOB;
|
|
|
|
do
|
|
{
|
|
/* We don't want to be notified about jobs stopping if job control
|
|
is not active. XXX - was interactive_shell instead of job_control */
|
|
waitpid_flags = (job_control && subshell_environment == 0)
|
|
? (WUNTRACED|wcontinued)
|
|
: 0;
|
|
if (sigchld || block == 0)
|
|
waitpid_flags |= WNOHANG;
|
|
|
|
/* Check for terminating signals and exit the shell if we receive one */
|
|
CHECK_TERMSIG;
|
|
/* Check for a trapped signal interrupting the wait builtin and jump out */
|
|
CHECK_WAIT_INTR;
|
|
|
|
if (block == 1 && queue_sigchld == 0 && (waitpid_flags & WNOHANG) == 0)
|
|
{
|
|
internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block"));
|
|
waitpid_flags |= WNOHANG;
|
|
}
|
|
|
|
pid = WAITPID (-1, &status, waitpid_flags);
|
|
|
|
#if 0
|
|
if (wpid != -1 && block)
|
|
itrace("waitchld: blocking waitpid returns %d", pid);
|
|
#endif
|
|
/* WCONTINUED may be rejected by waitpid as invalid even when defined */
|
|
if (wcontinued && pid < 0 && errno == EINVAL)
|
|
{
|
|
wcontinued = 0;
|
|
continue; /* jump back to the test and retry without WCONTINUED */
|
|
}
|
|
|
|
/* The check for WNOHANG is to make sure we decrement sigchld only
|
|
if it was non-zero before we called waitpid. */
|
|
if (sigchld > 0 && (waitpid_flags & WNOHANG))
|
|
sigchld--;
|
|
|
|
/* If waitpid returns -1 with errno == ECHILD, there are no more
|
|
unwaited-for child processes of this shell. */
|
|
if (pid < 0 && errno == ECHILD)
|
|
{
|
|
if (children_exited == 0)
|
|
return -1;
|
|
else
|
|
break;
|
|
}
|
|
|
|
#if 0
|
|
itrace("waitchld: waitpid returns %d block = %d", pid, block);
|
|
#endif
|
|
/* If waitpid returns 0, there are running children. If it returns -1,
|
|
the only other error POSIX says it can return is EINTR. */
|
|
CHECK_TERMSIG;
|
|
CHECK_WAIT_INTR;
|
|
|
|
/* If waitpid returns -1/EINTR and the shell saw a SIGINT, then we
|
|
assume the child has blocked or handled SIGINT. In that case, we
|
|
require the child to actually die due to SIGINT to act on the
|
|
SIGINT we received; otherwise we assume the child handled it and
|
|
let it go. */
|
|
if (pid < 0 && errno == EINTR && wait_sigint_received)
|
|
child_caught_sigint = 1;
|
|
|
|
if (pid <= 0)
|
|
continue; /* jumps right to the test */
|
|
|
|
/* If the child process did die due to SIGINT, forget our assumption
|
|
that it caught or otherwise handled it. */
|
|
if (WIFSIGNALED (status) && WTERMSIG (status) == SIGINT)
|
|
child_caught_sigint = 0;
|
|
|
|
/* children_exited is used to run traps on SIGCHLD. We don't want to
|
|
run the trap if a process is just being continued. */
|
|
if (WIFCONTINUED(status) == 0)
|
|
{
|
|
children_exited++;
|
|
js.c_living--;
|
|
}
|
|
|
|
/* Locate our PROCESS for this pid. */
|
|
child = find_process (pid, 1, &job); /* want living procs only */
|
|
|
|
#if defined (COPROCESS_SUPPORT)
|
|
coproc_pidchk (pid, WSTATUS(status));
|
|
#endif
|
|
|
|
/* It is not an error to have a child terminate that we did
|
|
not have a record of. This child could have been part of
|
|
a pipeline in backquote substitution. Even so, I'm not
|
|
sure child is ever non-zero. */
|
|
if (child == 0)
|
|
{
|
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
|
js.c_reaped++;
|
|
continue;
|
|
}
|
|
|
|
/* Remember status, and whether or not the process is running. */
|
|
child->status = status;
|
|
child->running = WIFCONTINUED(status) ? PS_RUNNING : PS_DONE;
|
|
|
|
if (PEXITED (child))
|
|
{
|
|
js.c_totreaped++;
|
|
if (job != NO_JOB)
|
|
js.c_reaped++;
|
|
}
|
|
|
|
if (job == NO_JOB)
|
|
continue;
|
|
|
|
call_set_current += set_job_status_and_cleanup (job);
|
|
|
|
if (STOPPED (job))
|
|
last_stopped_job = job;
|
|
else if (DEADJOB (job) && last_stopped_job == job)
|
|
last_stopped_job = NO_JOB;
|
|
}
|
|
while ((sigchld || block == 0) && pid > (pid_t)0);
|
|
|
|
/* If a job was running and became stopped, then set the current
|
|
job. Otherwise, don't change a thing. */
|
|
if (call_set_current)
|
|
{
|
|
if (last_stopped_job != NO_JOB)
|
|
set_current_job (last_stopped_job);
|
|
else
|
|
reset_current ();
|
|
}
|
|
|
|
/* Call a SIGCHLD trap handler for each child that exits, if one is set. */
|
|
if (job_control && signal_is_trapped (SIGCHLD) && children_exited &&
|
|
trap_list[SIGCHLD] != (char *)IGNORE_SIG)
|
|
{
|
|
if (posixly_correct && this_shell_builtin && this_shell_builtin == wait_builtin)
|
|
{
|
|
interrupt_immediately = 0;
|
|
trap_handler (SIGCHLD); /* set pending_traps[SIGCHLD] */
|
|
wait_signal_received = SIGCHLD;
|
|
/* If we're in a signal handler, let CHECK_WAIT_INTR pick it up;
|
|
run_pending_traps will call run_sigchld_trap later */
|
|
if (sigchld == 0)
|
|
longjmp (wait_intr_buf, 1);
|
|
}
|
|
/* If not in posix mode and not executing the wait builtin, queue the
|
|
signal for later handling. Run the trap immediately if we are
|
|
executing the wait builtin, but don't break out of `wait'. */
|
|
else if (sigchld) /* called from signal handler */
|
|
queue_sigchld_trap (children_exited);
|
|
else if (running_trap)
|
|
queue_sigchld_trap (children_exited);
|
|
else if (this_shell_builtin == wait_builtin)
|
|
run_sigchld_trap (children_exited); /* XXX */
|
|
else
|
|
queue_sigchld_trap (children_exited);
|
|
}
|
|
|
|
/* We have successfully recorded the useful information about this process
|
|
that has just changed state. If we notify asynchronously, and the job
|
|
that this process belongs to is no longer running, then notify the user
|
|
of that fact now. */
|
|
if (asynchronous_notification && interactive)
|
|
notify_of_job_status ();
|
|
|
|
return (children_exited);
|
|
}
|
|
|
|
/* Set the status of JOB and perform any necessary cleanup if the job is
|
|
marked as JDEAD.
|
|
|
|
Currently, the cleanup activity is restricted to handling any SIGINT
|
|
received while waiting for a foreground job to finish. */
|
|
static int
|
|
set_job_status_and_cleanup (job)
|
|
int job;
|
|
{
|
|
PROCESS *child;
|
|
int tstatus, job_state, any_stopped, any_tstped, call_set_current;
|
|
SigHandler *temp_handler;
|
|
|
|
child = jobs[job]->pipe;
|
|
jobs[job]->flags &= ~J_NOTIFIED;
|
|
|
|
call_set_current = 0;
|
|
|
|
/*
|
|
* COMPUTE JOB STATUS
|
|
*/
|
|
|
|
/* If all children are not running, but any of them is stopped, then
|
|
the job is stopped, not dead. */
|
|
job_state = any_stopped = any_tstped = 0;
|
|
do
|
|
{
|
|
job_state |= PRUNNING (child);
|
|
#if 0
|
|
if (PEXITED (child) && (WIFSTOPPED (child->status)))
|
|
#else
|
|
/* Only checking for WIFSTOPPED now, not for PS_DONE */
|
|
if (PSTOPPED (child))
|
|
#endif
|
|
{
|
|
any_stopped = 1;
|
|
any_tstped |= job_control && (WSTOPSIG (child->status) == SIGTSTP);
|
|
}
|
|
child = child->next;
|
|
}
|
|
while (child != jobs[job]->pipe);
|
|
|
|
/* If job_state != 0, the job is still running, so don't bother with
|
|
setting the process exit status and job state unless we're
|
|
transitioning from stopped to running. */
|
|
if (job_state != 0 && JOBSTATE(job) != JSTOPPED)
|
|
return 0;
|
|
|
|
/*
|
|
* SET JOB STATUS
|
|
*/
|
|
|
|
/* The job is either stopped or dead. Set the state of the job accordingly. */
|
|
if (any_stopped)
|
|
{
|
|
jobs[job]->state = JSTOPPED;
|
|
jobs[job]->flags &= ~J_FOREGROUND;
|
|
call_set_current++;
|
|
/* Suspending a job with SIGTSTP breaks all active loops. */
|
|
if (any_tstped && loop_level)
|
|
breaking = loop_level;
|
|
}
|
|
else if (job_state != 0) /* was stopped, now running */
|
|
{
|
|
jobs[job]->state = JRUNNING;
|
|
call_set_current++;
|
|
}
|
|
else
|
|
{
|
|
jobs[job]->state = JDEAD;
|
|
js.j_ndead++;
|
|
|
|
#if 0
|
|
if (IS_FOREGROUND (job))
|
|
setjstatus (job);
|
|
#endif
|
|
|
|
/* If this job has a cleanup function associated with it, call it
|
|
with `cleanarg' as the single argument, then set the function
|
|
pointer to NULL so it is not inadvertently called twice. The
|
|
cleanup function is responsible for deallocating cleanarg. */
|
|
if (jobs[job]->j_cleanup)
|
|
{
|
|
(*jobs[job]->j_cleanup) (jobs[job]->cleanarg);
|
|
jobs[job]->j_cleanup = (sh_vptrfunc_t *)NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CLEANUP
|
|
*
|
|
* Currently, we just do special things if we got a SIGINT while waiting
|
|
* for a foreground job to complete
|
|
*/
|
|
|
|
if (JOBSTATE (job) == JDEAD)
|
|
{
|
|
/* If we're running a shell script and we get a SIGINT with a
|
|
SIGINT trap handler, but the foreground job handles it and
|
|
does not exit due to SIGINT, run the trap handler but do not
|
|
otherwise act as if we got the interrupt. */
|
|
if (wait_sigint_received && interactive_shell == 0 &&
|
|
child_caught_sigint && IS_FOREGROUND (job) &&
|
|
signal_is_trapped (SIGINT))
|
|
{
|
|
int old_frozen;
|
|
wait_sigint_received = 0;
|
|
last_command_exit_value = process_exit_status (child->status);
|
|
|
|
old_frozen = jobs_list_frozen;
|
|
jobs_list_frozen = 1;
|
|
tstatus = maybe_call_trap_handler (SIGINT);
|
|
jobs_list_frozen = old_frozen;
|
|
}
|
|
|
|
/* If the foreground job is killed by SIGINT when job control is not
|
|
active, we need to perform some special handling.
|
|
|
|
The check of wait_sigint_received is a way to determine if the
|
|
SIGINT came from the keyboard (in which case the shell has already
|
|
seen it, and wait_sigint_received is non-zero, because keyboard
|
|
signals are sent to process groups) or via kill(2) to the foreground
|
|
process by another process (or itself). If the shell did receive the
|
|
SIGINT, it needs to perform normal SIGINT processing. */
|
|
else if (wait_sigint_received &&
|
|
child_caught_sigint == 0 &&
|
|
IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0)
|
|
{
|
|
int old_frozen;
|
|
|
|
wait_sigint_received = 0;
|
|
|
|
/* If SIGINT is trapped, set the exit status so that the trap
|
|
handler can see it. */
|
|
if (signal_is_trapped (SIGINT))
|
|
last_command_exit_value = process_exit_status (child->status);
|
|
|
|
/* If the signal is trapped, let the trap handler get it no matter
|
|
what and simply return if the trap handler returns.
|
|
maybe_call_trap_handler() may cause dead jobs to be removed from
|
|
the job table because of a call to execute_command. We work
|
|
around this by setting JOBS_LIST_FROZEN. */
|
|
old_frozen = jobs_list_frozen;
|
|
jobs_list_frozen = 1;
|
|
tstatus = maybe_call_trap_handler (SIGINT);
|
|
jobs_list_frozen = old_frozen;
|
|
if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER)
|
|
{
|
|
/* wait_sigint_handler () has already seen SIGINT and
|
|
allowed the wait builtin to jump out. We need to
|
|
call the original SIGINT handler, if necessary. If
|
|
the original handler is SIG_DFL, we need to resend
|
|
the signal to ourselves. */
|
|
|
|
temp_handler = old_sigint_handler;
|
|
|
|
/* Bogus. If we've reset the signal handler as the result
|
|
of a trap caught on SIGINT, then old_sigint_handler
|
|
will point to trap_handler, which now knows nothing about
|
|
SIGINT (if we reset the sighandler to the default).
|
|
In this case, we have to fix things up. What a crock. */
|
|
if (temp_handler == trap_handler && signal_is_trapped (SIGINT) == 0)
|
|
temp_handler = trap_to_sighandler (SIGINT);
|
|
restore_sigint_handler ();
|
|
if (temp_handler == SIG_DFL)
|
|
termsig_handler (SIGINT); /* XXX */
|
|
else if (temp_handler != SIG_IGN)
|
|
(*temp_handler) (SIGINT);
|
|
}
|
|
}
|
|
}
|
|
|
|
return call_set_current;
|
|
}
|
|
|
|
/* Build the array of values for the $PIPESTATUS variable from the set of
|
|
exit statuses of all processes in the job J. */
|
|
static void
|
|
setjstatus (j)
|
|
int j;
|
|
{
|
|
#if defined (ARRAY_VARS)
|
|
register int i;
|
|
register PROCESS *p;
|
|
|
|
for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++)
|
|
;
|
|
i++;
|
|
if (statsize < i)
|
|
{
|
|
pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int));
|
|
statsize = i;
|
|
}
|
|
i = 0;
|
|
p = jobs[j]->pipe;
|
|
do
|
|
{
|
|
pstatuses[i++] = process_exit_status (p->status);
|
|
p = p->next;
|
|
}
|
|
while (p != jobs[j]->pipe);
|
|
|
|
pstatuses[i] = -1; /* sentinel */
|
|
set_pipestatus_array (pstatuses, i);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
run_sigchld_trap (nchild)
|
|
int nchild;
|
|
{
|
|
char *trap_command;
|
|
int i;
|
|
|
|
/* Turn off the trap list during the call to parse_and_execute ()
|
|
to avoid potentially infinite recursive calls. Preserve the
|
|
values of last_command_exit_value, last_made_pid, and the_pipeline
|
|
around the execution of the trap commands. */
|
|
trap_command = savestring (trap_list[SIGCHLD]);
|
|
|
|
begin_unwind_frame ("SIGCHLD trap");
|
|
unwind_protect_int (last_command_exit_value);
|
|
unwind_protect_int (last_command_exit_signal);
|
|
unwind_protect_var (last_made_pid);
|
|
unwind_protect_int (interrupt_immediately);
|
|
unwind_protect_int (jobs_list_frozen);
|
|
unwind_protect_pointer (the_pipeline);
|
|
unwind_protect_pointer (subst_assign_varlist);
|
|
|
|
/* We have to add the commands this way because they will be run
|
|
in reverse order of adding. We don't want maybe_set_sigchld_trap ()
|
|
to reference freed memory. */
|
|
add_unwind_protect (xfree, trap_command);
|
|
add_unwind_protect (maybe_set_sigchld_trap, trap_command);
|
|
|
|
subst_assign_varlist = (WORD_LIST *)NULL;
|
|
the_pipeline = (PROCESS *)NULL;
|
|
|
|
running_trap = SIGCHLD + 1;
|
|
|
|
set_impossible_sigchld_trap ();
|
|
jobs_list_frozen = 1;
|
|
for (i = 0; i < nchild; i++)
|
|
{
|
|
#if 0
|
|
interrupt_immediately = 1;
|
|
#endif
|
|
parse_and_execute (savestring (trap_command), "trap", SEVAL_NOHIST|SEVAL_RESETLINE);
|
|
}
|
|
|
|
run_unwind_frame ("SIGCHLD trap");
|
|
running_trap = 0;
|
|
}
|
|
|
|
/* Function to call when you want to notify people of changes
|
|
in job status. This prints out all jobs which are pending
|
|
notification to stderr, and marks those printed as already
|
|
notified, thus making them candidates for cleanup. */
|
|
static void
|
|
notify_of_job_status ()
|
|
{
|
|
register int job, termsig;
|
|
char *dir;
|
|
sigset_t set, oset;
|
|
WAIT s;
|
|
|
|
if (jobs == 0 || js.j_jobslots == 0)
|
|
return;
|
|
|
|
if (old_ttou != 0)
|
|
{
|
|
sigemptyset (&set);
|
|
sigaddset (&set, SIGCHLD);
|
|
sigaddset (&set, SIGTTOU);
|
|
sigemptyset (&oset);
|
|
sigprocmask (SIG_BLOCK, &set, &oset);
|
|
}
|
|
else
|
|
queue_sigchld++;
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (job = 0, dir = (char *)NULL; job < js.j_jobslots; job++)
|
|
{
|
|
if (jobs[job] && IS_NOTIFIED (job) == 0)
|
|
{
|
|
s = raw_job_exit_status (job);
|
|
termsig = WTERMSIG (s);
|
|
|
|
/* POSIX.2 says we have to hang onto the statuses of at most the
|
|
last CHILD_MAX background processes if the shell is running a
|
|
script. If the shell is running a script, either from a file
|
|
or standard input, don't print anything unless the job was
|
|
killed by a signal. */
|
|
if (startup_state == 0 && WIFSIGNALED (s) == 0 &&
|
|
((DEADJOB (job) && IS_FOREGROUND (job) == 0) || STOPPED (job)))
|
|
continue;
|
|
|
|
#if 0
|
|
/* If job control is disabled, don't print the status messages.
|
|
Mark dead jobs as notified so that they get cleaned up. If
|
|
startup_state == 2, we were started to run `-c command', so
|
|
don't print anything. */
|
|
if ((job_control == 0 && interactive_shell) || startup_state == 2)
|
|
#else
|
|
/* If job control is disabled, don't print the status messages.
|
|
Mark dead jobs as notified so that they get cleaned up. If
|
|
startup_state == 2 and subshell_environment has the
|
|
SUBSHELL_COMSUB bit turned on, we were started to run a command
|
|
substitution, so don't print anything. */
|
|
if ((job_control == 0 && interactive_shell) ||
|
|
(startup_state == 2 && (subshell_environment & SUBSHELL_COMSUB)))
|
|
#endif
|
|
{
|
|
/* POSIX.2 compatibility: if the shell is not interactive,
|
|
hang onto the job corresponding to the last asynchronous
|
|
pid until the user has been notified of its status or does
|
|
a `wait'. */
|
|
if (DEADJOB (job) && (interactive_shell || (find_last_pid (job, 0) != last_asynchronous_pid)))
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
continue;
|
|
}
|
|
|
|
/* Print info on jobs that are running in the background,
|
|
and on foreground jobs that were killed by anything
|
|
except SIGINT (and possibly SIGPIPE). */
|
|
switch (JOBSTATE (job))
|
|
{
|
|
case JDEAD:
|
|
if (interactive_shell == 0 && termsig && WIFSIGNALED (s) &&
|
|
termsig != SIGINT &&
|
|
#if defined (DONT_REPORT_SIGTERM)
|
|
termsig != SIGTERM &&
|
|
#endif
|
|
#if defined (DONT_REPORT_SIGPIPE)
|
|
termsig != SIGPIPE &&
|
|
#endif
|
|
signal_is_trapped (termsig) == 0)
|
|
{
|
|
/* Don't print `0' for a line number. */
|
|
fprintf (stderr, _("%s: line %d: "), get_name_for_error (), (line_number == 0) ? 1 : line_number);
|
|
pretty_print_job (job, JLIST_NONINTERACTIVE, stderr);
|
|
}
|
|
else if (IS_FOREGROUND (job))
|
|
{
|
|
#if !defined (DONT_REPORT_SIGPIPE)
|
|
if (termsig && WIFSIGNALED (s) && termsig != SIGINT)
|
|
#else
|
|
if (termsig && WIFSIGNALED (s) && termsig != SIGINT && termsig != SIGPIPE)
|
|
#endif
|
|
{
|
|
fprintf (stderr, "%s", j_strsignal (termsig));
|
|
|
|
if (WIFCORED (s))
|
|
fprintf (stderr, _(" (core dumped)"));
|
|
|
|
fprintf (stderr, "\n");
|
|
}
|
|
}
|
|
else if (job_control) /* XXX job control test added */
|
|
{
|
|
if (dir == 0)
|
|
dir = current_working_directory ();
|
|
pretty_print_job (job, JLIST_STANDARD, stderr);
|
|
if (dir && strcmp (dir, jobs[job]->wd) != 0)
|
|
fprintf (stderr,
|
|
_("(wd now: %s)\n"), polite_directory_format (dir));
|
|
}
|
|
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
break;
|
|
|
|
case JSTOPPED:
|
|
fprintf (stderr, "\n");
|
|
if (dir == 0)
|
|
dir = current_working_directory ();
|
|
pretty_print_job (job, JLIST_STANDARD, stderr);
|
|
if (dir && (strcmp (dir, jobs[job]->wd) != 0))
|
|
fprintf (stderr,
|
|
_("(wd now: %s)\n"), polite_directory_format (dir));
|
|
jobs[job]->flags |= J_NOTIFIED;
|
|
break;
|
|
|
|
case JRUNNING:
|
|
case JMIXED:
|
|
break;
|
|
|
|
default:
|
|
programming_error ("notify_of_job_status");
|
|
}
|
|
}
|
|
}
|
|
if (old_ttou != 0)
|
|
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
|
|
else
|
|
queue_sigchld--;
|
|
}
|
|
|
|
/* Initialize the job control mechanism, and set up the tty stuff. */
|
|
int
|
|
initialize_job_control (force)
|
|
int force;
|
|
{
|
|
pid_t t;
|
|
int t_errno;
|
|
|
|
t_errno = -1;
|
|
shell_pgrp = getpgid (0);
|
|
|
|
if (shell_pgrp == -1)
|
|
{
|
|
sys_error (_("initialize_job_control: getpgrp failed"));
|
|
exit (1);
|
|
}
|
|
|
|
/* We can only have job control if we are interactive unless we force it. */
|
|
if (interactive == 0 && force == 0)
|
|
{
|
|
job_control = 0;
|
|
original_pgrp = NO_PID;
|
|
shell_tty = fileno (stderr);
|
|
}
|
|
else
|
|
{
|
|
shell_tty = -1;
|
|
|
|
/* If forced_interactive is set, we skip the normal check that stderr
|
|
is attached to a tty, so we need to check here. If it's not, we
|
|
need to see whether we have a controlling tty by opening /dev/tty,
|
|
since trying to use job control tty pgrp manipulations on a non-tty
|
|
is going to fail. */
|
|
if (forced_interactive && isatty (fileno (stderr)) == 0)
|
|
shell_tty = open ("/dev/tty", O_RDWR|O_NONBLOCK);
|
|
|
|
/* Get our controlling terminal. If job_control is set, or
|
|
interactive is set, then this is an interactive shell no
|
|
matter where fd 2 is directed. */
|
|
if (shell_tty == -1)
|
|
shell_tty = dup (fileno (stderr)); /* fd 2 */
|
|
|
|
if (shell_tty != -1)
|
|
shell_tty = move_to_high_fd (shell_tty, 1, -1);
|
|
|
|
/* Compensate for a bug in systems that compiled the BSD
|
|
rlogind with DEBUG defined, like NeXT and Alliant. */
|
|
if (shell_pgrp == 0)
|
|
{
|
|
shell_pgrp = getpid ();
|
|
setpgid (0, shell_pgrp);
|
|
tcsetpgrp (shell_tty, shell_pgrp);
|
|
}
|
|
|
|
while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1)
|
|
{
|
|
if (shell_pgrp != terminal_pgrp)
|
|
{
|
|
SigHandler *ottin;
|
|
|
|
ottin = set_signal_handler(SIGTTIN, SIG_DFL);
|
|
kill (0, SIGTTIN);
|
|
set_signal_handler (SIGTTIN, ottin);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (terminal_pgrp == -1)
|
|
t_errno = errno;
|
|
|
|
/* Make sure that we are using the new line discipline. */
|
|
if (set_new_line_discipline (shell_tty) < 0)
|
|
{
|
|
sys_error (_("initialize_job_control: line discipline"));
|
|
job_control = 0;
|
|
}
|
|
else
|
|
{
|
|
original_pgrp = shell_pgrp;
|
|
shell_pgrp = getpid ();
|
|
|
|
if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0))
|
|
{
|
|
sys_error (_("initialize_job_control: setpgid"));
|
|
shell_pgrp = original_pgrp;
|
|
}
|
|
|
|
job_control = 1;
|
|
|
|
/* If (and only if) we just set our process group to our pid,
|
|
thereby becoming a process group leader, and the terminal
|
|
is not in the same process group as our (new) process group,
|
|
then set the terminal's process group to our (new) process
|
|
group. If that fails, set our process group back to what it
|
|
was originally (so we can still read from the terminal) and
|
|
turn off job control. */
|
|
if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp)
|
|
{
|
|
if (give_terminal_to (shell_pgrp, 0) < 0)
|
|
{
|
|
t_errno = errno;
|
|
setpgid (0, original_pgrp);
|
|
shell_pgrp = original_pgrp;
|
|
errno = t_errno;
|
|
sys_error (_("cannot set terminal process group (%d)"), shell_pgrp);
|
|
job_control = 0;
|
|
}
|
|
}
|
|
|
|
if (job_control && ((t = tcgetpgrp (shell_tty)) == -1 || t != shell_pgrp))
|
|
{
|
|
if (t_errno != -1)
|
|
errno = t_errno;
|
|
sys_error (_("cannot set terminal process group (%d)"), t);
|
|
job_control = 0;
|
|
}
|
|
}
|
|
if (job_control == 0)
|
|
internal_error (_("no job control in this shell"));
|
|
}
|
|
|
|
if (shell_tty != fileno (stderr))
|
|
SET_CLOSE_ON_EXEC (shell_tty);
|
|
|
|
set_signal_handler (SIGCHLD, sigchld_handler);
|
|
|
|
change_flag ('m', job_control ? '-' : '+');
|
|
|
|
if (interactive)
|
|
get_tty_state ();
|
|
|
|
if (js.c_childmax < 0)
|
|
js.c_childmax = getmaxchild ();
|
|
if (js.c_childmax < 0)
|
|
js.c_childmax = DEFAULT_CHILD_MAX;
|
|
|
|
return job_control;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
debug_print_pgrps ()
|
|
{
|
|
itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
|
|
(long)original_pgrp, (long)shell_pgrp, (long)terminal_pgrp);
|
|
itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
|
|
shell_tty, (long)tcgetpgrp (shell_tty), (long)getpgid(0));
|
|
}
|
|
#endif
|
|
|
|
/* Set the line discipline to the best this system has to offer.
|
|
Return -1 if this is not possible. */
|
|
static int
|
|
set_new_line_discipline (tty)
|
|
int tty;
|
|
{
|
|
#if defined (NEW_TTY_DRIVER)
|
|
int ldisc;
|
|
|
|
if (ioctl (tty, TIOCGETD, &ldisc) < 0)
|
|
return (-1);
|
|
|
|
if (ldisc != NTTYDISC)
|
|
{
|
|
ldisc = NTTYDISC;
|
|
|
|
if (ioctl (tty, TIOCSETD, &ldisc) < 0)
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
#endif /* NEW_TTY_DRIVER */
|
|
|
|
#if defined (TERMIO_TTY_DRIVER)
|
|
# if defined (TERMIO_LDISC) && (NTTYDISC)
|
|
if (ioctl (tty, TCGETA, &shell_tty_info) < 0)
|
|
return (-1);
|
|
|
|
if (shell_tty_info.c_line != NTTYDISC)
|
|
{
|
|
shell_tty_info.c_line = NTTYDISC;
|
|
if (ioctl (tty, TCSETAW, &shell_tty_info) < 0)
|
|
return (-1);
|
|
}
|
|
# endif /* TERMIO_LDISC && NTTYDISC */
|
|
return (0);
|
|
#endif /* TERMIO_TTY_DRIVER */
|
|
|
|
#if defined (TERMIOS_TTY_DRIVER)
|
|
# if defined (TERMIOS_LDISC) && defined (NTTYDISC)
|
|
if (tcgetattr (tty, &shell_tty_info) < 0)
|
|
return (-1);
|
|
|
|
if (shell_tty_info.c_line != NTTYDISC)
|
|
{
|
|
shell_tty_info.c_line = NTTYDISC;
|
|
if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
|
|
return (-1);
|
|
}
|
|
# endif /* TERMIOS_LDISC && NTTYDISC */
|
|
return (0);
|
|
#endif /* TERMIOS_TTY_DRIVER */
|
|
|
|
#if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
|
|
return (-1);
|
|
#endif
|
|
}
|
|
|
|
/* Setup this shell to handle C-C, etc. */
|
|
void
|
|
initialize_job_signals ()
|
|
{
|
|
if (interactive)
|
|
{
|
|
set_signal_handler (SIGINT, sigint_sighandler);
|
|
set_signal_handler (SIGTSTP, SIG_IGN);
|
|
set_signal_handler (SIGTTOU, SIG_IGN);
|
|
set_signal_handler (SIGTTIN, SIG_IGN);
|
|
}
|
|
else if (job_control)
|
|
{
|
|
old_tstp = set_signal_handler (SIGTSTP, sigstop_sighandler);
|
|
old_ttin = set_signal_handler (SIGTTIN, sigstop_sighandler);
|
|
old_ttou = set_signal_handler (SIGTTOU, sigstop_sighandler);
|
|
}
|
|
/* Leave these things alone for non-interactive shells without job
|
|
control. */
|
|
}
|
|
|
|
/* Here we handle CONT signals. */
|
|
static sighandler
|
|
sigcont_sighandler (sig)
|
|
int sig;
|
|
{
|
|
initialize_job_signals ();
|
|
set_signal_handler (SIGCONT, old_cont);
|
|
kill (getpid (), SIGCONT);
|
|
|
|
SIGRETURN (0);
|
|
}
|
|
|
|
/* Here we handle stop signals while we are running not as a login shell. */
|
|
static sighandler
|
|
sigstop_sighandler (sig)
|
|
int sig;
|
|
{
|
|
set_signal_handler (SIGTSTP, old_tstp);
|
|
set_signal_handler (SIGTTOU, old_ttou);
|
|
set_signal_handler (SIGTTIN, old_ttin);
|
|
|
|
old_cont = set_signal_handler (SIGCONT, sigcont_sighandler);
|
|
|
|
give_terminal_to (shell_pgrp, 0);
|
|
|
|
kill (getpid (), sig);
|
|
|
|
SIGRETURN (0);
|
|
}
|
|
|
|
/* Give the terminal to PGRP. */
|
|
int
|
|
give_terminal_to (pgrp, force)
|
|
pid_t pgrp;
|
|
int force;
|
|
{
|
|
sigset_t set, oset;
|
|
int r, e;
|
|
|
|
r = 0;
|
|
if (job_control || force)
|
|
{
|
|
sigemptyset (&set);
|
|
sigaddset (&set, SIGTTOU);
|
|
sigaddset (&set, SIGTTIN);
|
|
sigaddset (&set, SIGTSTP);
|
|
sigaddset (&set, SIGCHLD);
|
|
sigemptyset (&oset);
|
|
sigprocmask (SIG_BLOCK, &set, &oset);
|
|
|
|
if (tcsetpgrp (shell_tty, pgrp) < 0)
|
|
{
|
|
/* Maybe we should print an error message? */
|
|
#if 0
|
|
sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
|
|
shell_tty, (long)getpid(), (long)pgrp);
|
|
#endif
|
|
r = -1;
|
|
e = errno;
|
|
}
|
|
else
|
|
terminal_pgrp = pgrp;
|
|
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
|
|
}
|
|
|
|
if (r == -1)
|
|
errno = e;
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the
|
|
flags to pass to give_terminal_to(). */
|
|
static int
|
|
maybe_give_terminal_to (opgrp, npgrp, flags)
|
|
pid_t opgrp, npgrp;
|
|
int flags;
|
|
{
|
|
int tpgrp;
|
|
|
|
tpgrp = tcgetpgrp (shell_tty);
|
|
if (tpgrp < 0 && errno == ENOTTY)
|
|
return -1;
|
|
if (tpgrp == npgrp)
|
|
{
|
|
terminal_pgrp = npgrp;
|
|
return 0;
|
|
}
|
|
else if (tpgrp != opgrp)
|
|
{
|
|
#if defined (DEBUG)
|
|
internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d", tpgrp, opgrp, npgrp);
|
|
#endif
|
|
return -1;
|
|
}
|
|
else
|
|
return (give_terminal_to (npgrp, flags));
|
|
}
|
|
|
|
/* Clear out any jobs in the job array. This is intended to be used by
|
|
children of the shell, who should not have any job structures as baggage
|
|
when they start executing (forking subshells for parenthesized execution
|
|
and functions with pipes are the two that spring to mind). If RUNNING_ONLY
|
|
is nonzero, only running jobs are removed from the table. */
|
|
void
|
|
delete_all_jobs (running_only)
|
|
int running_only;
|
|
{
|
|
register int i;
|
|
sigset_t set, oset;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
|
|
if (js.j_jobslots)
|
|
{
|
|
js.j_current = js.j_previous = NO_JOB;
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
|
|
delete_job (i, DEL_WARNSTOPPED);
|
|
}
|
|
if (running_only == 0)
|
|
{
|
|
free ((char *)jobs);
|
|
js.j_jobslots = 0;
|
|
js.j_firstj = js.j_lastj = js.j_njobs = 0;
|
|
}
|
|
}
|
|
|
|
if (running_only == 0)
|
|
bgp_clear ();
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
/* Mark all jobs in the job array so that they don't get a SIGHUP when the
|
|
shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
|
|
void
|
|
nohup_all_jobs (running_only)
|
|
int running_only;
|
|
{
|
|
register int i;
|
|
sigset_t set, oset;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
if (js.j_jobslots)
|
|
{
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
|
|
nohup_job (i);
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
int
|
|
count_all_jobs ()
|
|
{
|
|
int i, n;
|
|
sigset_t set, oset;
|
|
|
|
/* This really counts all non-dead jobs. */
|
|
BLOCK_CHILD (set, oset);
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = n = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i] && DEADJOB(i) == 0)
|
|
n++;
|
|
}
|
|
UNBLOCK_CHILD (oset);
|
|
return n;
|
|
}
|
|
|
|
static void
|
|
mark_all_jobs_as_dead ()
|
|
{
|
|
register int i;
|
|
sigset_t set, oset;
|
|
|
|
if (js.j_jobslots == 0)
|
|
return;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
if (jobs[i])
|
|
{
|
|
jobs[i]->state = JDEAD;
|
|
js.j_ndead++;
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
/* Mark all dead jobs as notified, so delete_job () cleans them out
|
|
of the job table properly. POSIX.2 says we need to save the
|
|
status of the last CHILD_MAX jobs, so we count the number of dead
|
|
jobs and mark only enough as notified to save CHILD_MAX statuses. */
|
|
static void
|
|
mark_dead_jobs_as_notified (force)
|
|
int force;
|
|
{
|
|
register int i, ndead, ndeadproc;
|
|
sigset_t set, oset;
|
|
|
|
if (js.j_jobslots == 0)
|
|
return;
|
|
|
|
BLOCK_CHILD (set, oset);
|
|
|
|
/* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
|
|
around; just run through the array. */
|
|
if (force)
|
|
{
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
|
|
jobs[i]->flags |= J_NOTIFIED;
|
|
}
|
|
UNBLOCK_CHILD (oset);
|
|
return;
|
|
}
|
|
|
|
/* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
|
|
array with the corresponding not marked as notified. This is a better
|
|
way to avoid pid aliasing and reuse problems than keeping the POSIX-
|
|
mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
|
|
bgpids list regulated. */
|
|
|
|
/* Count the number of dead jobs */
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = ndead = ndeadproc = 0; i < js.j_jobslots; i++)
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
if (jobs[i] && DEADJOB (i))
|
|
{
|
|
ndead++;
|
|
ndeadproc += processes_in_job (i);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
# if 0
|
|
if (ndeadproc != js.c_reaped)
|
|
itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc, js.c_reaped);
|
|
# endif
|
|
if (ndead != js.j_ndead)
|
|
itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead, js.j_ndead);
|
|
#endif
|
|
|
|
if (js.c_childmax < 0)
|
|
js.c_childmax = getmaxchild ();
|
|
if (js.c_childmax < 0)
|
|
js.c_childmax = DEFAULT_CHILD_MAX;
|
|
|
|
/* Don't do anything if the number of dead processes is less than CHILD_MAX
|
|
and we're not forcing a cleanup. */
|
|
if (ndeadproc <= js.c_childmax)
|
|
{
|
|
UNBLOCK_CHILD (oset);
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js.c_childmax, ndead, ndeadproc);
|
|
#endif
|
|
|
|
/* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
|
|
the list. This isn't exactly right yet; changes need to be made
|
|
to stop_pipeline so we don't mark the newer jobs after we've
|
|
created CHILD_MAX slots in the jobs array. This needs to be
|
|
integrated with a way to keep the jobs array from growing without
|
|
bound. Maybe we wrap back around to 0 after we reach some max
|
|
limit, and there are sufficient job slots free (keep track of total
|
|
size of jobs array (js.j_jobslots) and running count of number of jobs
|
|
in jobs array. Then keep a job index corresponding to the `oldest job'
|
|
and start this loop there, wrapping around as necessary. In effect,
|
|
we turn the list into a circular buffer. */
|
|
/* XXX could use js.j_firstj here */
|
|
for (i = 0; i < js.j_jobslots; i++)
|
|
{
|
|
if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
|
|
{
|
|
#if defined (DEBUG)
|
|
if (i < js.j_firstj && jobs[i])
|
|
itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
|
|
if (i > js.j_lastj && jobs[i])
|
|
itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
|
|
#endif
|
|
/* If marking this job as notified would drop us down below
|
|
child_max, don't mark it so we can keep at least child_max
|
|
statuses. XXX -- need to check what Posix actually says
|
|
about keeping statuses. */
|
|
if ((ndeadproc -= processes_in_job (i)) <= js.c_childmax)
|
|
break;
|
|
jobs[i]->flags |= J_NOTIFIED;
|
|
}
|
|
}
|
|
|
|
UNBLOCK_CHILD (oset);
|
|
}
|
|
|
|
/* Here to allow other parts of the shell (like the trap stuff) to
|
|
freeze and unfreeze the jobs list. */
|
|
void
|
|
freeze_jobs_list ()
|
|
{
|
|
jobs_list_frozen = 1;
|
|
}
|
|
|
|
void
|
|
unfreeze_jobs_list ()
|
|
{
|
|
jobs_list_frozen = 0;
|
|
}
|
|
|
|
/* Allow or disallow job control to take place. Returns the old value
|
|
of job_control. */
|
|
int
|
|
set_job_control (arg)
|
|
int arg;
|
|
{
|
|
int old;
|
|
|
|
old = job_control;
|
|
job_control = arg;
|
|
|
|
/* If we're turning on job control, reset pipeline_pgrp so make_child will
|
|
put new child processes into the right pgrp */
|
|
if (job_control != old && job_control)
|
|
pipeline_pgrp = 0;
|
|
|
|
return (old);
|
|
}
|
|
|
|
/* Turn off all traces of job control. This is run by children of the shell
|
|
which are going to do shellsy things, like wait (), etc. */
|
|
void
|
|
without_job_control ()
|
|
{
|
|
stop_making_children ();
|
|
start_pipeline ();
|
|
#if defined (PGRP_PIPE)
|
|
sh_closepipe (pgrp_pipe);
|
|
#endif
|
|
delete_all_jobs (0);
|
|
set_job_control (0);
|
|
}
|
|
|
|
/* If this shell is interactive, terminate all stopped jobs and
|
|
restore the original terminal process group. This is done
|
|
before the `exec' builtin calls shell_execve. */
|
|
void
|
|
end_job_control ()
|
|
{
|
|
if (interactive_shell) /* XXX - should it be interactive? */
|
|
{
|
|
terminate_stopped_jobs ();
|
|
|
|
if (original_pgrp >= 0)
|
|
give_terminal_to (original_pgrp, 1);
|
|
}
|
|
|
|
if (original_pgrp >= 0)
|
|
setpgid (0, original_pgrp);
|
|
}
|
|
|
|
/* Restart job control by closing shell tty and reinitializing. This is
|
|
called after an exec fails in an interactive shell and we do not exit. */
|
|
void
|
|
restart_job_control ()
|
|
{
|
|
if (shell_tty != -1)
|
|
close (shell_tty);
|
|
initialize_job_control (0);
|
|
}
|
|
|
|
void
|
|
set_maxchild (nchild)
|
|
int nchild;
|
|
{
|
|
static int lmaxchild = -1;
|
|
|
|
if (lmaxchild < 0)
|
|
lmaxchild = getmaxchild ();
|
|
if (lmaxchild < 0)
|
|
lmaxchild = DEFAULT_CHILD_MAX;
|
|
|
|
/* Clamp value we set. Minimum is what Posix requires, maximum is defined
|
|
above as MAX_CHILD_MAX. */
|
|
if (nchild < lmaxchild)
|
|
nchild = lmaxchild;
|
|
else if (nchild > MAX_CHILD_MAX)
|
|
nchild = MAX_CHILD_MAX;
|
|
|
|
js.c_childmax = nchild;
|
|
}
|
|
|
|
/* Set the handler to run when the shell receives a SIGCHLD signal. */
|
|
void
|
|
set_sigchld_handler ()
|
|
{
|
|
set_signal_handler (SIGCHLD, sigchld_handler);
|
|
}
|
|
|
|
#if defined (PGRP_PIPE)
|
|
/* Read from the read end of a pipe. This is how the process group leader
|
|
blocks until all of the processes in a pipeline have been made. */
|
|
static void
|
|
pipe_read (pp)
|
|
int *pp;
|
|
{
|
|
char ch;
|
|
|
|
if (pp[1] >= 0)
|
|
{
|
|
close (pp[1]);
|
|
pp[1] = -1;
|
|
}
|
|
|
|
if (pp[0] >= 0)
|
|
{
|
|
while (read (pp[0], &ch, 1) == -1 && errno == EINTR)
|
|
;
|
|
}
|
|
}
|
|
|
|
/* Functional interface closes our local-to-job-control pipes. */
|
|
void
|
|
close_pgrp_pipe ()
|
|
{
|
|
sh_closepipe (pgrp_pipe);
|
|
}
|
|
|
|
void
|
|
save_pgrp_pipe (p, clear)
|
|
int *p;
|
|
int clear;
|
|
{
|
|
p[0] = pgrp_pipe[0];
|
|
p[1] = pgrp_pipe[1];
|
|
if (clear)
|
|
pgrp_pipe[0] = pgrp_pipe[1] = -1;
|
|
}
|
|
|
|
void
|
|
restore_pgrp_pipe (p)
|
|
int *p;
|
|
{
|
|
pgrp_pipe[0] = p[0];
|
|
pgrp_pipe[1] = p[1];
|
|
}
|
|
|
|
#endif /* PGRP_PIPE */
|