mirror of https://github.com/n-hys/bash.git
783 lines
20 KiB
C
783 lines
20 KiB
C
/* sig.c - interface for shell signal handlers and signal initialization. */
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/* Copyright (C) 1994-2018 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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#if defined (HAVE_UNISTD_H)
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# ifdef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#include <stdio.h>
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#include <signal.h>
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#include "bashintl.h"
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#include "shell.h"
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#include "execute_cmd.h"
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#if defined (JOB_CONTROL)
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#include "jobs.h"
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#endif /* JOB_CONTROL */
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#include "siglist.h"
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#include "sig.h"
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#include "trap.h"
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#include "builtins/common.h"
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#include "builtins/builtext.h"
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#if defined (READLINE)
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# include "bashline.h"
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# include <readline/readline.h>
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#endif
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#if defined (HISTORY)
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# include "bashhist.h"
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#endif
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extern void initialize_siglist ();
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#if !defined (JOB_CONTROL)
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extern void initialize_job_signals __P((void));
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#endif
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/* Non-zero after SIGINT. */
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volatile sig_atomic_t interrupt_state = 0;
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/* Non-zero after SIGWINCH */
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volatile sig_atomic_t sigwinch_received = 0;
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/* Non-zero after SIGTERM */
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volatile sig_atomic_t sigterm_received = 0;
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/* Set to the value of any terminating signal received. */
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volatile sig_atomic_t terminating_signal = 0;
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/* The environment at the top-level R-E loop. We use this in
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the case of error return. */
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procenv_t top_level;
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#if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS)
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/* The signal masks that this shell runs with. */
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sigset_t top_level_mask;
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#endif /* JOB_CONTROL */
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/* When non-zero, we throw_to_top_level (). */
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int interrupt_immediately = 0;
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/* When non-zero, we call the terminating signal handler immediately. */
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int terminate_immediately = 0;
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#if defined (SIGWINCH)
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static SigHandler *old_winch = (SigHandler *)SIG_DFL;
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#endif
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static void initialize_shell_signals __P((void));
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void
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initialize_signals (reinit)
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int reinit;
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{
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initialize_shell_signals ();
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initialize_job_signals ();
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#if !defined (HAVE_SYS_SIGLIST) && !defined (HAVE_UNDER_SYS_SIGLIST) && !defined (HAVE_STRSIGNAL)
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if (reinit == 0)
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initialize_siglist ();
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#endif /* !HAVE_SYS_SIGLIST && !HAVE_UNDER_SYS_SIGLIST && !HAVE_STRSIGNAL */
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}
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/* A structure describing a signal that terminates the shell if not
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caught. The orig_handler member is present so children can reset
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these signals back to their original handlers. */
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struct termsig {
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int signum;
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SigHandler *orig_handler;
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int orig_flags;
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int core_dump;
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};
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#define NULL_HANDLER (SigHandler *)SIG_DFL
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/* The list of signals that would terminate the shell if not caught.
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We catch them, but just so that we can write the history file,
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and so forth. */
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static struct termsig terminating_signals[] = {
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#ifdef SIGHUP
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{ SIGHUP, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGINT
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{ SIGINT, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGILL
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{ SIGILL, NULL_HANDLER, 0, 1},
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#endif
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#ifdef SIGTRAP
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{ SIGTRAP, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGIOT
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{ SIGIOT, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGDANGER
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{ SIGDANGER, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGEMT
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{ SIGEMT, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGFPE
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{ SIGFPE, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGBUS
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{ SIGBUS, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGSEGV
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{ SIGSEGV, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGSYS
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{ SIGSYS, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGPIPE
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{ SIGPIPE, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGALRM
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{ SIGALRM, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGTERM
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{ SIGTERM, NULL_HANDLER, 0 },
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#endif
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/* These don't generate core dumps on anything but Linux, but we're doing
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this just for Linux anyway. */
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#ifdef SIGXCPU
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{ SIGXCPU, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGXFSZ
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{ SIGXFSZ, NULL_HANDLER, 0, 1 },
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#endif
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#ifdef SIGVTALRM
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{ SIGVTALRM, NULL_HANDLER, 0 },
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#endif
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#if 0
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#ifdef SIGPROF
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{ SIGPROF, NULL_HANDLER, 0 },
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#endif
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#endif
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#ifdef SIGLOST
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{ SIGLOST, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGUSR1
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{ SIGUSR1, NULL_HANDLER, 0 },
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#endif
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#ifdef SIGUSR2
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{ SIGUSR2, NULL_HANDLER, 0 },
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#endif
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};
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#define TERMSIGS_LENGTH (sizeof (terminating_signals) / sizeof (struct termsig))
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#define XSIG(x) (terminating_signals[x].signum)
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#define XHANDLER(x) (terminating_signals[x].orig_handler)
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#define XSAFLAGS(x) (terminating_signals[x].orig_flags)
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#define XCOREDUMP(x) (terminating_signals[x].core_dump)
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static int termsigs_initialized = 0;
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/* Initialize signals that will terminate the shell to do some
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unwind protection. For non-interactive shells, we only call
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this when a trap is defined for EXIT (0) or when trap is run
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to display signal dispositions. */
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void
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initialize_terminating_signals ()
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{
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register int i;
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#if defined (HAVE_POSIX_SIGNALS)
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struct sigaction act, oact;
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#endif
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if (termsigs_initialized)
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return;
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/* The following code is to avoid an expensive call to
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set_signal_handler () for each terminating_signals. Fortunately,
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this is possible in Posix. Unfortunately, we have to call signal ()
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on non-Posix systems for each signal in terminating_signals. */
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#if defined (HAVE_POSIX_SIGNALS)
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act.sa_handler = termsig_sighandler;
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act.sa_flags = 0;
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sigemptyset (&act.sa_mask);
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sigemptyset (&oact.sa_mask);
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for (i = 0; i < TERMSIGS_LENGTH; i++)
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sigaddset (&act.sa_mask, XSIG (i));
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for (i = 0; i < TERMSIGS_LENGTH; i++)
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{
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/* If we've already trapped it, don't do anything. */
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if (signal_is_trapped (XSIG (i)))
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continue;
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sigaction (XSIG (i), &act, &oact);
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XHANDLER(i) = oact.sa_handler;
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XSAFLAGS(i) = oact.sa_flags;
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/* Don't do anything with signals that are ignored at shell entry
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if the shell is not interactive. */
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/* XXX - should we do this for interactive shells, too? */
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if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN)
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{
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sigaction (XSIG (i), &oact, &act);
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set_signal_hard_ignored (XSIG (i));
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}
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#if defined (SIGPROF) && !defined (_MINIX)
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if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN)
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sigaction (XSIG (i), &oact, (struct sigaction *)NULL);
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#endif /* SIGPROF && !_MINIX */
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}
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#else /* !HAVE_POSIX_SIGNALS */
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for (i = 0; i < TERMSIGS_LENGTH; i++)
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{
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/* If we've already trapped it, don't do anything. */
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if (signal_is_trapped (XSIG (i)))
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continue;
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XHANDLER(i) = signal (XSIG (i), termsig_sighandler);
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XSAFLAGS(i) = 0;
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/* Don't do anything with signals that are ignored at shell entry
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if the shell is not interactive. */
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/* XXX - should we do this for interactive shells, too? */
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if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN)
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{
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signal (XSIG (i), SIG_IGN);
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set_signal_hard_ignored (XSIG (i));
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}
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#ifdef SIGPROF
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if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN)
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signal (XSIG (i), XHANDLER (i));
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#endif
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}
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#endif /* !HAVE_POSIX_SIGNALS */
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termsigs_initialized = 1;
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}
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static void
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initialize_shell_signals ()
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{
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if (interactive)
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initialize_terminating_signals ();
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#if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS)
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/* All shells use the signal mask they inherit, and pass it along
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to child processes. Children will never block SIGCHLD, though. */
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sigemptyset (&top_level_mask);
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sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &top_level_mask);
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# if defined (SIGCHLD)
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sigdelset (&top_level_mask, SIGCHLD);
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# endif
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#endif /* JOB_CONTROL || HAVE_POSIX_SIGNALS */
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/* And, some signals that are specifically ignored by the shell. */
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set_signal_handler (SIGQUIT, SIG_IGN);
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if (interactive)
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{
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set_signal_handler (SIGINT, sigint_sighandler);
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get_original_signal (SIGTERM);
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if (signal_is_hard_ignored (SIGTERM) == 0)
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set_signal_handler (SIGTERM, sigterm_sighandler);
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set_sigwinch_handler ();
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}
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}
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void
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reset_terminating_signals ()
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{
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register int i;
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#if defined (HAVE_POSIX_SIGNALS)
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struct sigaction act;
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#endif
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if (termsigs_initialized == 0)
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return;
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#if defined (HAVE_POSIX_SIGNALS)
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act.sa_flags = 0;
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sigemptyset (&act.sa_mask);
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for (i = 0; i < TERMSIGS_LENGTH; i++)
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{
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/* Skip a signal if it's trapped or handled specially, because the
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trap code will restore the correct value. */
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if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i)))
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continue;
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act.sa_handler = XHANDLER (i);
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act.sa_flags = XSAFLAGS (i);
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sigaction (XSIG (i), &act, (struct sigaction *) NULL);
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}
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#else /* !HAVE_POSIX_SIGNALS */
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for (i = 0; i < TERMSIGS_LENGTH; i++)
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{
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if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i)))
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continue;
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signal (XSIG (i), XHANDLER (i));
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}
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#endif /* !HAVE_POSIX_SIGNALS */
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termsigs_initialized = 0;
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}
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#undef XHANDLER
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/* Run some of the cleanups that should be performed when we run
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jump_to_top_level from a builtin command context. XXX - might want to
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also call reset_parser here. */
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void
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top_level_cleanup ()
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{
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/* Clean up string parser environment. */
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while (parse_and_execute_level)
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parse_and_execute_cleanup (-1);
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#if defined (PROCESS_SUBSTITUTION)
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unlink_fifo_list ();
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#endif /* PROCESS_SUBSTITUTION */
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run_unwind_protects ();
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loop_level = continuing = breaking = funcnest = 0;
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executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0;
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}
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/* What to do when we've been interrupted, and it is safe to handle it. */
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void
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throw_to_top_level ()
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{
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int print_newline = 0;
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if (interrupt_state)
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{
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if (last_command_exit_value < 128)
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last_command_exit_value = 128 + SIGINT;
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print_newline = 1;
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DELINTERRUPT;
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}
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if (interrupt_state)
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return;
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last_command_exit_signal = (last_command_exit_value > 128) ?
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(last_command_exit_value - 128) : 0;
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last_command_exit_value |= 128;
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/* Run any traps set on SIGINT, mostly for interactive shells */
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if (signal_is_trapped (SIGINT))
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run_interrupt_trap (1);
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/* Clean up string parser environment. */
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while (parse_and_execute_level)
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parse_and_execute_cleanup (-1);
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if (running_trap > 0)
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run_trap_cleanup (running_trap - 1);
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#if defined (JOB_CONTROL)
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give_terminal_to (shell_pgrp, 0);
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#endif /* JOB_CONTROL */
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#if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS)
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/* This needs to stay because jobs.c:make_child() uses it without resetting
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the signal mask. */
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sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
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#endif
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reset_parser ();
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#if defined (READLINE)
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if (interactive)
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bashline_reset ();
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#endif /* READLINE */
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#if defined (PROCESS_SUBSTITUTION)
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unlink_fifo_list ();
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#endif /* PROCESS_SUBSTITUTION */
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run_unwind_protects ();
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loop_level = continuing = breaking = funcnest = 0;
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executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0;
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if (interactive && print_newline)
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{
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fflush (stdout);
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fprintf (stderr, "\n");
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fflush (stderr);
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}
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/* An interrupted `wait' command in a script does not exit the script. */
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if (interactive || (interactive_shell && !shell_initialized) ||
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(print_newline && signal_is_trapped (SIGINT)))
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jump_to_top_level (DISCARD);
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else
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jump_to_top_level (EXITPROG);
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}
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/* This is just here to isolate the longjmp calls. */
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void
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jump_to_top_level (value)
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int value;
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{
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sh_longjmp (top_level, value);
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}
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sighandler
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termsig_sighandler (sig)
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int sig;
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{
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/* If we get called twice with the same signal before handling it,
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terminate right away. */
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if (
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#ifdef SIGHUP
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sig != SIGHUP &&
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#endif
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#ifdef SIGINT
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sig != SIGINT &&
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#endif
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#ifdef SIGDANGER
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sig != SIGDANGER &&
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#endif
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#ifdef SIGPIPE
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sig != SIGPIPE &&
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#endif
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#ifdef SIGALRM
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sig != SIGALRM &&
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#endif
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#ifdef SIGTERM
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sig != SIGTERM &&
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#endif
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#ifdef SIGXCPU
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sig != SIGXCPU &&
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#endif
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#ifdef SIGXFSZ
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sig != SIGXFSZ &&
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#endif
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#ifdef SIGVTALRM
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sig != SIGVTALRM &&
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#endif
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#ifdef SIGLOST
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sig != SIGLOST &&
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#endif
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#ifdef SIGUSR1
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sig != SIGUSR1 &&
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#endif
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#ifdef SIGUSR2
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sig != SIGUSR2 &&
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#endif
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sig == terminating_signal)
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terminate_immediately = 1;
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terminating_signal = sig;
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/* XXX - should this also trigger when interrupt_immediately is set? */
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if (terminate_immediately)
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{
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#if defined (HISTORY)
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/* XXX - will inhibit history file being written */
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# if defined (READLINE)
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if (interactive_shell == 0 || interactive == 0 || (sig != SIGHUP && sig != SIGTERM) || no_line_editing || (RL_ISSTATE (RL_STATE_READCMD) == 0))
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# endif
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history_lines_this_session = 0;
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#endif
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terminate_immediately = 0;
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termsig_handler (sig);
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}
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#if defined (READLINE)
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/* Set the event hook so readline will call it after the signal handlers
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finish executing, so if this interrupted character input we can get
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quick response. If readline is active or has modified the terminal we
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need to set this no matter what the signal is, though the check for
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RL_STATE_TERMPREPPED is possibly redundant. */
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if (RL_ISSTATE (RL_STATE_SIGHANDLER) || RL_ISSTATE (RL_STATE_TERMPREPPED))
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bashline_set_event_hook ();
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#endif
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SIGRETURN (0);
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}
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void
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termsig_handler (sig)
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int sig;
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{
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static int handling_termsig = 0;
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int i, core;
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sigset_t mask;
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/* Simple semaphore to keep this function from being executed multiple
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times. Since we no longer are running as a signal handler, we don't
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block multiple occurrences of the terminating signals while running. */
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if (handling_termsig)
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return;
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handling_termsig = 1;
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terminating_signal = 0; /* keep macro from re-testing true. */
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/* I don't believe this condition ever tests true. */
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if (sig == SIGINT && signal_is_trapped (SIGINT))
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run_interrupt_trap (0);
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#if defined (HISTORY)
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/* If we don't do something like this, the history will not be saved when
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an interactive shell is running in a terminal window that gets closed
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with the `close' button. We can't test for RL_STATE_READCMD because
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readline no longer handles SIGTERM synchronously. */
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if (interactive_shell && interactive && (sig == SIGHUP || sig == SIGTERM) && remember_on_history)
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maybe_save_shell_history ();
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#endif /* HISTORY */
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if (this_shell_builtin == read_builtin)
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read_tty_cleanup ();
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#if defined (JOB_CONTROL)
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if (sig == SIGHUP && (interactive || (subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB))))
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hangup_all_jobs ();
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if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB)) == 0)
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end_job_control ();
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#endif /* JOB_CONTROL */
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#if defined (PROCESS_SUBSTITUTION)
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unlink_fifo_list ();
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#endif /* PROCESS_SUBSTITUTION */
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/* Reset execution context */
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loop_level = continuing = breaking = funcnest = 0;
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executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0;
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run_exit_trap (); /* XXX - run exit trap possibly in signal context? */
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/* We don't change the set of blocked signals. If a user starts the shell
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with a terminating signal blocked, we won't get here (and if by some
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magic chance we do, we'll exit below). */
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set_signal_handler (sig, SIG_DFL);
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kill (getpid (), sig);
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if (dollar_dollar_pid != 1)
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exit (128+sig); /* just in case the kill fails? */
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/* We get here only under extraordinary circumstances. */
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/* We are PID 1, and the kill above failed to kill the process. We assume
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this means that we are running as an init process in a pid namespace
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on Linux. In this case, we can't send ourselves a fatal signal, so we
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determine whether or not we should have generated a core dump with the
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kill call and attempt to trick the kernel into generating one if
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necessary. */
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sigprocmask (SIG_SETMASK, (sigset_t *)NULL, &mask);
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for (i = core = 0; i < TERMSIGS_LENGTH; i++)
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{
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set_signal_handler (XSIG (i), SIG_DFL);
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sigdelset (&mask, XSIG (i));
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if (sig == XSIG (i))
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core = XCOREDUMP (i);
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}
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sigprocmask (SIG_SETMASK, &mask, (sigset_t *)NULL);
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if (core)
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*((volatile unsigned long *) NULL) = 0xdead0000 + sig; /* SIGSEGV */
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exit (128+sig);
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}
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#undef XSIG
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/* What we really do when SIGINT occurs. */
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sighandler
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sigint_sighandler (sig)
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int sig;
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{
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#if defined (MUST_REINSTALL_SIGHANDLERS)
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signal (sig, sigint_sighandler);
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#endif
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/* interrupt_state needs to be set for the stack of interrupts to work
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right. Should it be set unconditionally? */
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if (interrupt_state == 0)
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ADDINTERRUPT;
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/* We will get here in interactive shells with job control active; allow
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an interactive wait to be interrupted. wait_intr_flag is only set during
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the execution of the wait builtin and when wait_intr_buf is valid. */
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if (wait_intr_flag)
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{
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last_command_exit_value = 128 + sig;
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wait_signal_received = sig;
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SIGRETURN (0);
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}
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if (interrupt_immediately)
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{
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interrupt_immediately = 0;
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last_command_exit_value = 128 + sig;
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throw_to_top_level ();
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}
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#if defined (READLINE)
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/* Set the event hook so readline will call it after the signal handlers
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finish executing, so if this interrupted character input we can get
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quick response. */
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else if (RL_ISSTATE (RL_STATE_SIGHANDLER))
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bashline_set_event_hook ();
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#endif
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SIGRETURN (0);
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}
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#if defined (SIGWINCH)
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sighandler
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sigwinch_sighandler (sig)
|
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int sig;
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{
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#if defined (MUST_REINSTALL_SIGHANDLERS)
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set_signal_handler (SIGWINCH, sigwinch_sighandler);
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#endif /* MUST_REINSTALL_SIGHANDLERS */
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sigwinch_received = 1;
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SIGRETURN (0);
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}
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#endif /* SIGWINCH */
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void
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set_sigwinch_handler ()
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{
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#if defined (SIGWINCH)
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old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
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#endif
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}
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void
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unset_sigwinch_handler ()
|
|
{
|
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#if defined (SIGWINCH)
|
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set_signal_handler (SIGWINCH, old_winch);
|
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#endif
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}
|
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|
|
sighandler
|
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sigterm_sighandler (sig)
|
|
int sig;
|
|
{
|
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sigterm_received = 1; /* XXX - counter? */
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SIGRETURN (0);
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}
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/* Signal functions used by the rest of the code. */
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#if !defined (HAVE_POSIX_SIGNALS)
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/* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */
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sigprocmask (operation, newset, oldset)
|
|
int operation, *newset, *oldset;
|
|
{
|
|
int old, new;
|
|
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if (newset)
|
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new = *newset;
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else
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new = 0;
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|
switch (operation)
|
|
{
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|
case SIG_BLOCK:
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old = sigblock (new);
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break;
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case SIG_SETMASK:
|
|
old = sigsetmask (new);
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break;
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default:
|
|
internal_error (_("sigprocmask: %d: invalid operation"), operation);
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}
|
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if (oldset)
|
|
*oldset = old;
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}
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|
#else
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|
#if !defined (SA_INTERRUPT)
|
|
# define SA_INTERRUPT 0
|
|
#endif
|
|
|
|
#if !defined (SA_RESTART)
|
|
# define SA_RESTART 0
|
|
#endif
|
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|
|
SigHandler *
|
|
set_signal_handler (sig, handler)
|
|
int sig;
|
|
SigHandler *handler;
|
|
{
|
|
struct sigaction act, oact;
|
|
|
|
act.sa_handler = handler;
|
|
act.sa_flags = 0;
|
|
|
|
/* XXX - bash-4.2 */
|
|
/* We don't want a child death to interrupt interruptible system calls, even
|
|
if we take the time to reap children */
|
|
#if defined (SIGCHLD)
|
|
if (sig == SIGCHLD)
|
|
act.sa_flags |= SA_RESTART; /* XXX */
|
|
#endif
|
|
/* Let's see if we can keep SIGWINCH from interrupting interruptible system
|
|
calls, like open(2)/read(2)/write(2) */
|
|
#if defined (SIGWINCH)
|
|
if (sig == SIGWINCH)
|
|
act.sa_flags |= SA_RESTART; /* XXX */
|
|
#endif
|
|
/* If we're installing a SIGTERM handler for interactive shells, we want
|
|
it to be as close to SIG_IGN as possible. */
|
|
if (sig == SIGTERM && handler == sigterm_sighandler)
|
|
act.sa_flags |= SA_RESTART; /* XXX */
|
|
|
|
sigemptyset (&act.sa_mask);
|
|
sigemptyset (&oact.sa_mask);
|
|
if (sigaction (sig, &act, &oact) == 0)
|
|
return (oact.sa_handler);
|
|
else
|
|
return (SIG_DFL);
|
|
}
|
|
#endif /* HAVE_POSIX_SIGNALS */
|