114 lines
3 KiB
C++
114 lines
3 KiB
C++
/* Copyright (C) 2016-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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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This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#include "signals-state-save-restore.h"
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#include "gdbsupport/gdb-sigmask.h"
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#include <signal.h>
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/* The original signal actions and mask. */
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#ifdef HAVE_SIGACTION
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static struct sigaction original_signal_actions[NSIG];
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static sigset_t original_signal_mask;
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#endif
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/* See signals-state-save-restore.h. */
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void
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save_original_signals_state (bool quiet)
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{
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#ifdef HAVE_SIGACTION
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int i;
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int res;
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res = gdb_sigmask (0, NULL, &original_signal_mask);
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if (res == -1)
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perror_with_name (("sigprocmask"));
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bool found_preinstalled = false;
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for (i = 1; i < NSIG; i++)
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{
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struct sigaction *oldact = &original_signal_actions[i];
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res = sigaction (i, NULL, oldact);
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if (res == -1 && errno == EINVAL)
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{
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/* Some signal numbers in the range are invalid. */
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continue;
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}
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else if (res == -1)
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perror_with_name (("sigaction"));
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/* If we find a custom signal handler already installed, then
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this function was called too late. This is a warning instead
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of an internal error because this can also happen if you
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LD_PRELOAD a library that installs a signal handler early via
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__attribute__((constructor)), like libSegFault.so. */
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if (!quiet
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&& oldact->sa_handler != SIG_DFL
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&& oldact->sa_handler != SIG_IGN)
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{
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found_preinstalled = true;
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/* Use raw fprintf here because we're being called in early
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startup, before GDB's filtered streams are created. */
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fprintf (stderr,
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_("warning: Found custom handler for signal "
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"%d (%s) preinstalled.\n"), i,
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strsignal (i));
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}
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}
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if (found_preinstalled)
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{
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fprintf (stderr, _("\
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Some signal dispositions inherited from the environment (SIG_DFL/SIG_IGN)\n\
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won't be propagated to spawned programs.\n"));
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}
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#endif
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}
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/* See signals-state-save-restore.h. */
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void
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restore_original_signals_state (void)
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{
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#ifdef HAVE_SIGACTION
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int i;
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int res;
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for (i = 1; i < NSIG; i++)
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{
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res = sigaction (i, &original_signal_actions[i], NULL);
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if (res == -1 && errno == EINVAL)
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{
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/* Some signal numbers in the range are invalid. */
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continue;
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}
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else if (res == -1)
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perror_with_name (("sigaction"));
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}
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res = gdb_sigmask (SIG_SETMASK, &original_signal_mask, NULL);
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if (res == -1)
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perror_with_name (("sigprocmask"));
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#endif
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}
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