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