/* sig.c - interface for shell signal handlers and signal initialization. */
-/* Copyright (C) 1994 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2009 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
- Bash is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bash is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with Bash; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
#include "config.h"
#include <stdio.h>
#include <signal.h>
+#include "bashintl.h"
+
#include "shell.h"
#if defined (JOB_CONTROL)
#include "jobs.h"
#endif
extern int last_command_exit_value;
+extern int last_command_exit_signal;
extern int return_catch_flag;
extern int loop_level, continuing, breaking;
+extern int executing_list;
+extern int comsub_ignore_return;
extern int parse_and_execute_level, shell_initialized;
-extern int startup_state;
/* Non-zero after SIGINT. */
-int interrupt_state;
+volatile int interrupt_state = 0;
+
+/* Non-zero after SIGWINCH */
+volatile int sigwinch_received = 0;
+
+/* Set to the value of any terminating signal received. */
+volatile int terminating_signal = 0;
/* The environment at the top-level R-E loop. We use this in
the case of error return. */
/* When non-zero, we throw_to_top_level (). */
int interrupt_immediately = 0;
+/* When non-zero, we call the terminating signal handler immediately. */
+int terminate_immediately = 0;
+
+#if defined (SIGWINCH)
+static SigHandler *old_winch = (SigHandler *)SIG_DFL;
+#endif
+
static void initialize_shell_signals __P((void));
void
-initialize_signals ()
+initialize_signals (reinit)
+ int reinit;
{
initialize_shell_signals ();
initialize_job_signals ();
#if !defined (HAVE_SYS_SIGLIST) && !defined (HAVE_UNDER_SYS_SIGLIST) && !defined (HAVE_STRSIGNAL)
- initialize_siglist ();
+ if (reinit == 0)
+ initialize_siglist ();
#endif /* !HAVE_SYS_SIGLIST && !HAVE_UNDER_SYS_SIGLIST && !HAVE_STRSIGNAL */
}
-void
-reinitialize_signals ()
-{
- initialize_shell_signals ();
- initialize_job_signals ();
-}
-
/* A structure describing a signal that terminates the shell if not
caught. The orig_handler member is present so children can reset
these signals back to their original handlers. */
struct termsig {
int signum;
SigHandler *orig_handler;
+ int orig_flags;
};
#define NULL_HANDLER (SigHandler *)SIG_DFL
and so forth. */
static struct termsig terminating_signals[] = {
#ifdef SIGHUP
-{ SIGHUP, NULL_HANDLER },
+{ SIGHUP, NULL_HANDLER, 0 },
#endif
#ifdef SIGINT
-{ SIGINT, NULL_HANDLER },
+{ SIGINT, NULL_HANDLER, 0 },
#endif
#ifdef SIGILL
-{ SIGILL, NULL_HANDLER },
+{ SIGILL, NULL_HANDLER, 0 },
#endif
#ifdef SIGTRAP
-{ SIGTRAP, NULL_HANDLER },
+{ SIGTRAP, NULL_HANDLER, 0 },
#endif
#ifdef SIGIOT
-{ SIGIOT, NULL_HANDLER },
+{ SIGIOT, NULL_HANDLER, 0 },
#endif
#ifdef SIGDANGER
-{ SIGDANGER, NULL_HANDLER },
+{ SIGDANGER, NULL_HANDLER, 0 },
#endif
#ifdef SIGEMT
-{ SIGEMT, NULL_HANDLER },
+{ SIGEMT, NULL_HANDLER, 0 },
#endif
#ifdef SIGFPE
-{ SIGFPE, NULL_HANDLER },
+{ SIGFPE, NULL_HANDLER, 0 },
#endif
#ifdef SIGBUS
-{ SIGBUS, NULL_HANDLER },
+{ SIGBUS, NULL_HANDLER, 0 },
#endif
#ifdef SIGSEGV
-{ SIGSEGV, NULL_HANDLER },
+{ SIGSEGV, NULL_HANDLER, 0 },
#endif
#ifdef SIGSYS
-{ SIGSYS, NULL_HANDLER },
+{ SIGSYS, NULL_HANDLER, 0 },
#endif
#ifdef SIGPIPE
-{ SIGPIPE, NULL_HANDLER },
+{ SIGPIPE, NULL_HANDLER, 0 },
#endif
#ifdef SIGALRM
-{ SIGALRM, NULL_HANDLER },
+{ SIGALRM, NULL_HANDLER, 0 },
#endif
#ifdef SIGTERM
-{ SIGTERM, NULL_HANDLER },
+{ SIGTERM, NULL_HANDLER, 0 },
#endif
#ifdef SIGXCPU
-{ SIGXCPU, NULL_HANDLER },
+{ SIGXCPU, NULL_HANDLER, 0 },
#endif
#ifdef SIGXFSZ
-{ SIGXFSZ, NULL_HANDLER },
+{ SIGXFSZ, NULL_HANDLER, 0 },
#endif
#ifdef SIGVTALRM
-{ SIGVTALRM, NULL_HANDLER },
+{ SIGVTALRM, NULL_HANDLER, 0 },
#endif
#if 0
#ifdef SIGPROF
-{ SIGPROF, NULL_HANDLER },
+{ SIGPROF, NULL_HANDLER, 0 },
#endif
#endif
#ifdef SIGLOST
-{ SIGLOST, NULL_HANDLER },
+{ SIGLOST, NULL_HANDLER, 0 },
#endif
#ifdef SIGUSR1
-{ SIGUSR1, NULL_HANDLER },
+{ SIGUSR1, NULL_HANDLER, 0 },
#endif
#ifdef SIGUSR2
-{ SIGUSR2, NULL_HANDLER },
+{ SIGUSR2, NULL_HANDLER, 0 },
#endif
};
#define XSIG(x) (terminating_signals[x].signum)
#define XHANDLER(x) (terminating_signals[x].orig_handler)
+#define XSAFLAGS(x) (terminating_signals[x].orig_flags)
static int termsigs_initialized = 0;
this is possible in Posix. Unfortunately, we have to call signal ()
on non-Posix systems for each signal in terminating_signals. */
#if defined (HAVE_POSIX_SIGNALS)
- act.sa_handler = termination_unwind_protect;
+ act.sa_handler = termsig_sighandler;
act.sa_flags = 0;
sigemptyset (&act.sa_mask);
sigemptyset (&oact.sa_mask);
sigaddset (&act.sa_mask, XSIG (i));
for (i = 0; i < TERMSIGS_LENGTH; i++)
{
+ /* If we've already trapped it, don't do anything. */
+ if (signal_is_trapped (XSIG (i)))
+ continue;
+
sigaction (XSIG (i), &act, &oact);
XHANDLER(i) = oact.sa_handler;
+ XSAFLAGS(i) = oact.sa_flags;
/* Don't do anything with signals that are ignored at shell entry
if the shell is not interactive. */
if (!interactive_shell && XHANDLER (i) == SIG_IGN)
for (i = 0; i < TERMSIGS_LENGTH; i++)
{
- XHANDLER(i) = signal (XSIG (i), termination_unwind_protect);
+ /* If we've already trapped it, don't do anything. */
+ if (signal_is_trapped (XSIG (i)))
+ continue;
+
+ XHANDLER(i) = signal (XSIG (i), termsig_sighandler);
+ XSAFLAGS(i) = 0;
/* Don't do anything with signals that are ignored at shell entry
if the shell is not interactive. */
if (!interactive_shell && XHANDLER (i) == SIG_IGN)
{
set_signal_handler (SIGINT, sigint_sighandler);
set_signal_handler (SIGTERM, SIG_IGN);
+ set_sigwinch_handler ();
}
}
continue;
act.sa_handler = XHANDLER (i);
+ act.sa_flags = XSAFLAGS (i);
sigaction (XSIG (i), &act, (struct sigaction *) NULL);
}
#else /* !HAVE_POSIX_SIGNALS */
#undef XSIG
#undef XHANDLER
+/* Run some of the cleanups that should be performed when we run
+ jump_to_top_level from a builtin command context. XXX - might want to
+ also call reset_parser here. */
+void
+top_level_cleanup ()
+{
+ /* Clean up string parser environment. */
+ while (parse_and_execute_level)
+ parse_and_execute_cleanup ();
+
+#if defined (PROCESS_SUBSTITUTION)
+ unlink_fifo_list ();
+#endif /* PROCESS_SUBSTITUTION */
+
+ run_unwind_protects ();
+ loop_level = continuing = breaking = 0;
+ executing_list = comsub_ignore_return = return_catch_flag = 0;
+}
+
/* What to do when we've been interrupted, and it is safe to handle it. */
void
throw_to_top_level ()
if (interrupt_state)
return;
+ last_command_exit_signal = (last_command_exit_value > 128) ?
+ (last_command_exit_value - 128) : 0;
last_command_exit_value |= 128;
/* Run any traps set on SIGINT. */
run_interrupt_trap ();
- /* Cleanup string parser environment. */
+ /* Clean up string parser environment. */
while (parse_and_execute_level)
parse_and_execute_cleanup ();
#if defined (READLINE)
if (interactive)
- bashline_reinitialize ();
+ bashline_reset ();
#endif /* READLINE */
#if defined (PROCESS_SUBSTITUTION)
run_unwind_protects ();
loop_level = continuing = breaking = 0;
- return_catch_flag = 0;
+ executing_list = comsub_ignore_return = return_catch_flag = 0;
if (interactive && print_newline)
{
}
sighandler
-termination_unwind_protect (sig)
+termsig_sighandler (sig)
+ int sig;
+{
+ /* If we get called twice with the same signal before handling it,
+ terminate right away. */
+ if (
+#ifdef SIGHUP
+ sig != SIGHUP &&
+#endif
+#ifdef SIGINT
+ sig != SIGINT &&
+#endif
+#ifdef SIGDANGER
+ sig != SIGDANGER &&
+#endif
+#ifdef SIGPIPE
+ sig != SIGPIPE &&
+#endif
+#ifdef SIGALRM
+ sig != SIGALRM &&
+#endif
+#ifdef SIGTERM
+ sig != SIGTERM &&
+#endif
+#ifdef SIGXCPU
+ sig != SIGXCPU &&
+#endif
+#ifdef SIGXFSZ
+ sig != SIGXFSZ &&
+#endif
+#ifdef SIGVTALRM
+ sig != SIGVTALRM &&
+#endif
+#ifdef SIGLOST
+ sig != SIGLOST &&
+#endif
+#ifdef SIGUSR1
+ sig != SIGUSR1 &&
+#endif
+#ifdef SIGUSR2
+ sig != SIGUSR2 &&
+#endif
+ sig == terminating_signal)
+ terminate_immediately = 1;
+
+ terminating_signal = sig;
+
+ /* XXX - should this also trigger when interrupt_immediately is set? */
+ if (terminate_immediately)
+ {
+ terminate_immediately = 0;
+ termsig_handler (sig);
+ }
+
+ SIGRETURN (0);
+}
+
+void
+termsig_handler (sig)
int sig;
{
+ static int handling_termsig = 0;
+
+ /* Simple semaphore to keep this function from being executed multiple
+ times. Since we no longer are running as a signal handler, we don't
+ block multiple occurrences of the terminating signals while running. */
+ if (handling_termsig)
+ return;
+ handling_termsig = 1;
+ terminating_signal = 0; /* keep macro from re-testing true. */
+
+ /* I don't believe this condition ever tests true. */
if (sig == SIGINT && signal_is_trapped (SIGINT))
run_interrupt_trap ();
unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */
+ /* Reset execution context */
+ loop_level = continuing = breaking = 0;
+ executing_list = comsub_ignore_return = return_catch_flag = 0;
+
run_exit_trap ();
set_signal_handler (sig, SIG_DFL);
kill (getpid (), sig);
-
- SIGRETURN (0);
}
/* What we really do when SIGINT occurs. */
SIGRETURN (0);
}
+#if defined (SIGWINCH)
+sighandler
+sigwinch_sighandler (sig)
+ int sig;
+{
+#if defined (MUST_REINSTALL_SIGHANDLERS)
+ set_signal_handler (SIGWINCH, sigwinch_sighandler);
+#endif /* MUST_REINSTALL_SIGHANDLERS */
+ sigwinch_received = 1;
+ SIGRETURN (0);
+}
+#endif /* SIGWINCH */
+
+void
+set_sigwinch_handler ()
+{
+#if defined (SIGWINCH)
+ old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
+#endif
+}
+
+void
+unset_sigwinch_handler ()
+{
+#if defined (SIGWINCH)
+ set_signal_handler (SIGWINCH, old_winch);
+#endif
+}
+
/* Signal functions used by the rest of the code. */
#if !defined (HAVE_POSIX_SIGNALS)
break;
default:
- internal_error ("Bad code in sig.c: sigprocmask");
+ internal_error (_("sigprocmask: %d: invalid operation"), operation);
}
if (oldset)
projects / platform / upstream / bash.git / blobdiff