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/*
* Copyright (c) 2022 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "cimple" project.
* For details, see https://github.com/egor-tensin/cimple.
* Distributed under the MIT License.
*/
#include "signal.h"
#include "compiler.h"
#include "log.h"
#include <signal.h>
#include <string.h>
volatile sig_atomic_t global_stop_flag = 0;
static void set_global_stop_flag(UNUSED int signum)
{
global_stop_flag = 1;
}
static int my_sigaction(int signo, const struct sigaction *act)
{
int ret = 0;
ret = sigaction(signo, act, NULL);
if (ret < 0) {
log_errno("sigaction");
return ret;
}
return ret;
}
int signal_install_global_handler(void)
{
int ret = 0;
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = set_global_stop_flag;
/* Don't care about proper cleanup here; we exit the program if this
* fails anyway. */
ret = my_sigaction(SIGINT, &sa);
if (ret < 0)
return ret;
ret = my_sigaction(SIGQUIT, &sa);
if (ret < 0)
return ret;
ret = my_sigaction(SIGTERM, &sa);
if (ret < 0)
return ret;
return ret;
}
int signal_set(const sigset_t *new, sigset_t *old)
{
int ret = 0;
ret = sigprocmask(SIG_SETMASK, new, old);
if (ret < 0) {
log_errno("sigprocmask");
return ret;
}
return ret;
}
int signal_block_parent(sigset_t *old)
{
sigset_t new;
sigfillset(&new);
return signal_set(&new, old);
}
int signal_block_child(void)
{
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGQUIT);
sigaddset(&set, SIGTERM);
return signal_set(&set, NULL);
}
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