mirror of https://github.com/n-hys/bash.git
254 lines
8.5 KiB
C
254 lines
8.5 KiB
C
/* jobs.h -- structures and definitions used by the jobs.c file. */
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/* Copyright (C) 1993-2009 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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#if !defined (_JOBS_H_)
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# define _JOBS_H_
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#include "quit.h"
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#include "siglist.h"
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#include "stdc.h"
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#include "posixwait.h"
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/* Defines controlling the fashion in which jobs are listed. */
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#define JLIST_STANDARD 0
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#define JLIST_LONG 1
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#define JLIST_PID_ONLY 2
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#define JLIST_CHANGED_ONLY 3
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#define JLIST_NONINTERACTIVE 4
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/* I looked it up. For pretty_print_job (). The real answer is 24. */
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#define LONGEST_SIGNAL_DESC 24
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/* The max time to sleep while retrying fork() on EAGAIN failure */
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#define FORKSLEEP_MAX 16
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/* We keep an array of jobs. Each entry in the array is a linked list
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of processes that are piped together. The first process encountered is
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the group leader. */
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/* Values for the `running' field of a struct process. */
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#define PS_DONE 0
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#define PS_RUNNING 1
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#define PS_STOPPED 2
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#define PS_RECYCLED 4
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/* Each child of the shell is remembered in a STRUCT PROCESS. A circular
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chain of such structures is a pipeline. */
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typedef struct process {
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struct process *next; /* Next process in the pipeline. A circular chain. */
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pid_t pid; /* Process ID. */
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WAIT status; /* The status of this command as returned by wait. */
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int running; /* Non-zero if this process is running. */
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char *command; /* The particular program that is running. */
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} PROCESS;
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/* PALIVE really means `not exited' */
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#define PSTOPPED(p) (WIFSTOPPED((p)->status))
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#define PRUNNING(p) ((p)->running == PS_RUNNING)
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#define PALIVE(p) (PRUNNING(p) || PSTOPPED(p))
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#define PEXITED(p) ((p)->running == PS_DONE)
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#if defined (RECYCLES_PIDS)
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# define PRECYCLED(p) ((p)->running == PS_RECYCLED)
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#else
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# define PRECYCLED(p) (0)
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#endif
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#define PDEADPROC(p) (PEXITED(p) || PRECYCLED(p))
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#define get_job_by_jid(ind) (jobs[(ind)])
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/* A description of a pipeline's state. */
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typedef enum { JNONE = -1, JRUNNING = 1, JSTOPPED = 2, JDEAD = 4, JMIXED = 8 } JOB_STATE;
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#define JOBSTATE(job) (jobs[(job)]->state)
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#define J_JOBSTATE(j) ((j)->state)
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#define STOPPED(j) (jobs[(j)]->state == JSTOPPED)
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#define RUNNING(j) (jobs[(j)]->state == JRUNNING)
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#define DEADJOB(j) (jobs[(j)]->state == JDEAD)
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#define INVALID_JOB(j) ((j) < 0 || (j) >= js.j_jobslots || get_job_by_jid(j) == 0)
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/* Values for the FLAGS field in the JOB struct below. */
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#define J_FOREGROUND 0x01 /* Non-zero if this is running in the foreground. */
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#define J_NOTIFIED 0x02 /* Non-zero if already notified about job state. */
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#define J_JOBCONTROL 0x04 /* Non-zero if this job started under job control. */
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#define J_NOHUP 0x08 /* Don't send SIGHUP to job if shell gets SIGHUP. */
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#define J_STATSAVED 0x10 /* A process in this job had had status saved via $! */
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#define J_ASYNC 0x20 /* Job was started asynchronously */
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#define IS_FOREGROUND(j) ((jobs[j]->flags & J_FOREGROUND) != 0)
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#define IS_NOTIFIED(j) ((jobs[j]->flags & J_NOTIFIED) != 0)
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#define IS_JOBCONTROL(j) ((jobs[j]->flags & J_JOBCONTROL) != 0)
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#define IS_ASYNC(j) ((jobs[j]->flags & J_ASYNC) != 0)
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typedef struct job {
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char *wd; /* The working directory at time of invocation. */
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PROCESS *pipe; /* The pipeline of processes that make up this job. */
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pid_t pgrp; /* The process ID of the process group (necessary). */
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JOB_STATE state; /* The state that this job is in. */
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int flags; /* Flags word: J_NOTIFIED, J_FOREGROUND, or J_JOBCONTROL. */
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#if defined (JOB_CONTROL)
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COMMAND *deferred; /* Commands that will execute when this job is done. */
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sh_vptrfunc_t *j_cleanup; /* Cleanup function to call when job marked JDEAD */
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PTR_T cleanarg; /* Argument passed to (*j_cleanup)() */
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#endif /* JOB_CONTROL */
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} JOB;
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struct jobstats {
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/* limits */
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long c_childmax;
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/* child process statistics */
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int c_living; /* running or stopped child processes */
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int c_reaped; /* exited child processes still in jobs list */
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int c_injobs; /* total number of child processes in jobs list */
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/* child process totals */
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int c_totforked; /* total number of children this shell has forked */
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int c_totreaped; /* total number of children this shell has reaped */
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/* job counters and indices */
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int j_jobslots; /* total size of jobs array */
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int j_lastj; /* last (newest) job allocated */
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int j_firstj; /* first (oldest) job allocated */
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int j_njobs; /* number of non-NULL jobs in jobs array */
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int j_ndead; /* number of JDEAD jobs in jobs array */
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/* */
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int j_current; /* current job */
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int j_previous; /* previous job */
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/* */
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JOB *j_lastmade; /* last job allocated by stop_pipeline */
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JOB *j_lastasync; /* last async job allocated by stop_pipeline */
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};
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struct pidstat {
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struct pidstat *next;
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pid_t pid;
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int status;
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};
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struct bgpids {
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struct pidstat *list;
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struct pidstat *end;
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int npid;
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};
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#define NO_JOB -1 /* An impossible job array index. */
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#define DUP_JOB -2 /* A possible return value for get_job_spec (). */
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#define BAD_JOBSPEC -3 /* Bad syntax for job spec. */
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/* A value which cannot be a process ID. */
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#define NO_PID (pid_t)-1
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#define ANY_PID (pid_t)-1
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/* System calls. */
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#if !defined (HAVE_UNISTD_H)
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extern pid_t fork (), getpid (), getpgrp ();
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#endif /* !HAVE_UNISTD_H */
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/* Stuff from the jobs.c file. */
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extern struct jobstats js;
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extern pid_t original_pgrp, shell_pgrp, pipeline_pgrp;
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extern volatile pid_t last_made_pid, last_asynchronous_pid;
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extern int asynchronous_notification;
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extern JOB **jobs;
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extern void making_children __P((void));
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extern void stop_making_children __P((void));
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extern void cleanup_the_pipeline __P((void));
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extern void save_pipeline __P((int));
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extern void restore_pipeline __P((int));
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extern void start_pipeline __P((void));
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extern int stop_pipeline __P((int, COMMAND *));
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extern void append_process __P((char *, pid_t, int, int));
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extern void delete_job __P((int, int));
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extern void nohup_job __P((int));
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extern void delete_all_jobs __P((int));
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extern void nohup_all_jobs __P((int));
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extern int count_all_jobs __P((void));
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extern void terminate_current_pipeline __P((void));
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extern void terminate_stopped_jobs __P((void));
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extern void hangup_all_jobs __P((void));
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extern void kill_current_pipeline __P((void));
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#if defined (__STDC__) && defined (pid_t)
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extern int get_job_by_pid __P((int, int));
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extern void describe_pid __P((int));
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#else
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extern int get_job_by_pid __P((pid_t, int));
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extern void describe_pid __P((pid_t));
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#endif
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extern void list_one_job __P((JOB *, int, int, int));
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extern void list_all_jobs __P((int));
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extern void list_stopped_jobs __P((int));
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extern void list_running_jobs __P((int));
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extern pid_t make_child __P((char *, int));
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extern int get_tty_state __P((void));
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extern int set_tty_state __P((void));
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extern int job_exit_status __P((int));
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extern int job_exit_signal __P((int));
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extern int wait_for_single_pid __P((pid_t));
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extern void wait_for_background_pids __P((void));
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extern int wait_for __P((pid_t));
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extern int wait_for_job __P((int));
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extern int wait_for_any_job __P((void));
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extern void notify_and_cleanup __P((void));
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extern void reap_dead_jobs __P((void));
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extern int start_job __P((int, int));
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extern int kill_pid __P((pid_t, int, int));
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extern int initialize_job_control __P((int));
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extern void initialize_job_signals __P((void));
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extern int give_terminal_to __P((pid_t, int));
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extern void run_sigchld_trap __P((int));
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extern void freeze_jobs_list __P((void));
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extern void unfreeze_jobs_list __P((void));
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extern int set_job_control __P((int));
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extern void without_job_control __P((void));
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extern void end_job_control __P((void));
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extern void restart_job_control __P((void));
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extern void set_sigchld_handler __P((void));
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extern void ignore_tty_job_signals __P((void));
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extern void default_tty_job_signals __P((void));
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extern void init_job_stats __P((void));
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extern void close_pgrp_pipe __P((void));
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extern void save_pgrp_pipe __P((int *, int));
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extern void restore_pgrp_pipe __P((int *));
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extern void set_maxchild __P((int));
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extern int job_control; /* set to 0 in nojobs.c */
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#endif /* _JOBS_H_ */
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