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/*-
* redshift-ng - Automatically adjust display colour temperature according the Sun
*
* Copyright (c) 2009-2018 Jon Lund Steffensen <jonlst@gmail.com>
* Copyright (c) 2014-2016, 2025 Mattias Andrée <m@maandree.se>
*
* redshift-ng 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-ng 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-ng. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
volatile sig_atomic_t exiting = 0;
volatile sig_atomic_t disable = 0;
volatile enum signals signals = 0;
/**
* Signal handler for exit signals (SIGINT, SIGTERM, SIGQUIT)
*
* @param signo The received signal
*/
static void
sigexit(int signo)
{
exiting = 1;
#ifdef WINDOWS
signal(signo, &sigexit);
#endif
(void) signo;
}
#ifndef WINDOWS
/**
* Signal handler for disable signal (SIGUSR1)
*
* @param signo The received signal
*/
static void
sigdisable(int signo)
{
disable = 1;
(void) signo;
}
/**
* Signal handler for forceful exiting; installed by
* `install_forceful_exit_signal_handlers`
*
* @param signo The received signal
*/
static void
sigalrm(int signo)
{
if (exiting || signo == SIGALRM)
exit(0);
exiting = 1;
alarm(1U);
}
/**
* Signal handler for SIGUSR2
*
* @param signo The received signal
* @param info The received signal data
* @param uctx Interrupted stack context
*/
static void
sigipc(int signo, siginfo_t *info, void *uctx)
{
int set, mask;
sigset_t sigusr2_mask;
(void) signo;
(void) uctx;
if (info->si_code != SI_QUEUE)
return;
switch (info->si_value.sival_int) {
case 1:
case 2:
mask = 3 << 1;
break;
case 5:
case 6:
mask = 3 << 5;
break;
case 7:
case 8:
mask = 3 << 7;
break;
case 11:
case 12:
mask = 3 << 11;
break;
case 0:
case 3:
case 4:
case 9:
case 10:
mask = 0;
break;
default:
return;
}
signals |= set = 1 << info->si_value.sival_int;
signals &= ~mask | set;
if (set == SIGNAL_ORDER_BARRIER) {
sigemptyset(&sigusr2_mask);
sigaddset(&sigusr2_mask, SIGUSR2);
if (sigprocmask(SIG_BLOCK, &sigusr2_mask, NULL))
eprintf("sigprocmask:");
}
}
#endif
void
install_signal_handlers(void)
{
#ifdef WINDOWS
if (signal(SIGINT, &sigexit) == SIG_ERR)
eprintf("signal SIGINT <function pointer>:");
if (signal(SIGTERM, &sigexit) == SIG_ERR)
eprintf("signal SIGTERM <function pointer>:");
#else
struct sigaction sigact;
sigset_t sigset;
memset(&sigact, 0, sizeof(sigact));
sigemptyset(&sigset);
sigact.sa_mask = sigset;
sigact.sa_flags = SA_NODEFER;
sigact.sa_handler = &sigexit;
if (sigaction(SIGINT, &sigact, NULL))
eprintf("sigaction SIGINT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=SA_NODEFER} NULL:");
if (sigaction(SIGTERM, &sigact, NULL))
eprintf("sigaction SIGTERM &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=SA_NODEFER} NULL:");
if (sigaction(SIGQUIT, &sigact, NULL))
eprintf("sigaction SIGQUIT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=SA_NODEFER} NULL:");
sigact.sa_handler = &sigdisable;
if (sigaction(SIGUSR1, &sigact, NULL))
eprintf("sigaction SIGUSR1 &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=SA_NODEFER} NULL:");
sigact.sa_flags = 0;
sigact.sa_handler = SIG_IGN; /* cause child processes (hooks) to be reaped automatically */
if (sigaction(SIGCHLD, &sigact, NULL))
eprintf("sigaction SIGCHLD &{.sa_handler=SIG_IGN, .sa_mask={}, .sa_flags=0} NULL:");
sigact.sa_flags = SA_SIGINFO;
sigact.sa_sigaction = &sigipc;
if (sigaction(SIGUSR2, &sigact, NULL))
eprintf("sigaction SIGUSR2 &{.sa_sigaction=<function pointer>, .sa_mask={}, .sa_flags=SA_SIGINFO} NULL:");
#endif
}
#ifndef WINDOWS
void
install_forceful_exit_signal_handlers(void)
{
struct sigaction sigact;
sigset_t sigset;
exiting = 0;
memset(&sigact, 0, sizeof(sigact));
sigemptyset(&sigset);
sigact.sa_mask = sigset;
sigact.sa_flags = 0;
sigact.sa_handler = &sigalrm;
if (sigaction(SIGINT, &sigact, NULL))
eprintf("sigaction SIGINT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
if (sigaction(SIGTERM, &sigact, NULL))
eprintf("sigaction SIGTERM &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
if (sigaction(SIGQUIT, &sigact, NULL))
eprintf("sigaction SIGQUIT &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
if (sigaction(SIGALRM, &sigact, NULL))
eprintf("sigaction SIGALRM &{.sa_handler=<function pointer>, .sa_mask={}, .sa_flags=0} NULL:");
}
#endif
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