113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/* signals.c -- Signal processing source
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This file is part of Redshift.
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Redshift 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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Redshift 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 Redshift. If not, see <http://www.gnu.org/licenses/>.
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Copyright (c) 2009-2015 Jon Lund Steffensen <jonlst@gmail.com>
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Copyright (c) 2015 Mattias Andrée <maandree@member.fsf.org>
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#if defined(HAVE_SIGNAL_H) && !defined(__WIN32__)
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# include <signal.h>
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#endif
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#include "signals.h"
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#if defined(HAVE_SIGNAL_H) && !defined(__WIN32__)
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volatile sig_atomic_t exiting = 0;
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volatile sig_atomic_t disable = 0;
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/* Signal handler for exit signals */
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static void
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sigexit(int signo)
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{
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exiting = 1;
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}
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/* Signal handler for disable signal */
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static void
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sigdisable(int signo)
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{
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disable = 1;
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}
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#else /* ! HAVE_SIGNAL_H || __WIN32__ */
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int disable = 0;
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int exiting = 0;
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#endif /* ! HAVE_SIGNAL_H || __WIN32__ */
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int
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signals_install_handlers(void)
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{
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#if defined(HAVE_SIGNAL_H) && !defined(__WIN32__)
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struct sigaction sigact;
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sigset_t sigset;
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int r;
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sigemptyset(&sigset);
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/* Install signal handler for INT and TERM signals */
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sigact.sa_handler = sigexit;
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sigact.sa_mask = sigset;
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sigact.sa_flags = 0;
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r = sigaction(SIGINT, &sigact, NULL);
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if (r < 0) {
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perror("sigaction");
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return -1;
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}
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r = sigaction(SIGTERM, &sigact, NULL);
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if (r < 0) {
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perror("sigaction");
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return -1;
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}
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/* Install signal handler for USR1 signal */
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sigact.sa_handler = sigdisable;
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sigact.sa_mask = sigset;
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sigact.sa_flags = 0;
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r = sigaction(SIGUSR1, &sigact, NULL);
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if (r < 0) {
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perror("sigaction");
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return -1;
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}
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/* Ignore CHLD signal. This causes child processes
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(hooks) to be reaped automatically. */
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sigact.sa_handler = SIG_IGN;
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sigact.sa_mask = sigset;
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sigact.sa_flags = 0;
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r = sigaction(SIGCHLD, &sigact, NULL);
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if (r < 0) {
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perror("sigaction");
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return -1;
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}
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#endif /* HAVE_SIGNAL_H && ! __WIN32__ */
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return 0;
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}
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