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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 <stddef.h>
#include <string.h>
static int stop_signals[] = {SIGINT, SIGTERM, SIGQUIT};
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_handle_stops(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. */
for (size_t i = 0; i < sizeof(stop_signals) / sizeof(stop_signals[0]); ++i) {
ret = my_sigaction(stop_signals[i], &sa);
if (ret < 0)
return ret;
}
return ret;
}
static 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_all(sigset_t *old)
{
sigset_t new;
sigfillset(&new);
return signal_set(&new, old);
}
int signal_block_stops(void)
{
sigset_t set;
sigemptyset(&set);
for (size_t i = 0; i < sizeof(stop_signals) / sizeof(stop_signals[0]); ++i)
sigaddset(&set, stop_signals[i]);
return signal_set(&set, NULL);
}
int signal_restore(const sigset_t *new)
{
return signal_set(new, NULL);
}
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