| /* Copyright (C) 2016 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program 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. |
| |
| This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "common-defs.h" |
| #include "signals-state-save-restore.h" |
| |
| #include <signal.h> |
| |
| /* The original signal actions and mask. */ |
| |
| #ifdef HAVE_SIGACTION |
| static struct sigaction original_signal_actions[NSIG]; |
| |
| /* Note that we use sigprocmask without worrying about threads because |
| the save/restore functions are called either from main, or after a |
| fork. In both cases, we know the calling process is single |
| threaded. */ |
| static sigset_t original_signal_mask; |
| #endif |
| |
| /* See signals-state-save-restore.h. */ |
| |
| void |
| save_original_signals_state (void) |
| { |
| #ifdef HAVE_SIGACTION |
| int i; |
| int res; |
| |
| res = sigprocmask (0, NULL, &original_signal_mask); |
| if (res == -1) |
| perror_with_name (("sigprocmask")); |
| |
| for (i = 1; i < NSIG; i++) |
| { |
| struct sigaction *oldact = &original_signal_actions[i]; |
| |
| res = sigaction (i, NULL, oldact); |
| if (res == -1 && errno == EINVAL) |
| { |
| /* Some signal numbers in the range are invalid. */ |
| continue; |
| } |
| else if (res == -1) |
| perror_with_name (("sigaction")); |
| |
| /* If we find a custom signal handler already installed, then |
| this function was called too late. */ |
| if (oldact->sa_handler != SIG_DFL && oldact->sa_handler != SIG_IGN) |
| internal_error (__FILE__, __LINE__, _("unexpected signal handler")); |
| } |
| #endif |
| } |
| |
| /* See signals-state-save-restore.h. */ |
| |
| void |
| restore_original_signals_state (void) |
| { |
| #ifdef HAVE_SIGACTION |
| int i; |
| int res; |
| |
| for (i = 1; i < NSIG; i++) |
| { |
| res = sigaction (i, &original_signal_actions[i], NULL); |
| if (res == -1 && errno == EINVAL) |
| { |
| /* Some signal numbers in the range are invalid. */ |
| continue; |
| } |
| else if (res == -1) |
| perror_with_name (("sigaction")); |
| } |
| |
| res = sigprocmask (SIG_SETMASK, &original_signal_mask, NULL); |
| if (res == -1) |
| perror_with_name (("sigprocmask")); |
| #endif |
| } |