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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 "event_loop.h"
#include "file.h"
#include "log.h"
#include <signal.h>
#include <stddef.h>
#include <sys/signalfd.h>
#include <unistd.h>
static int stop_signals[] = {SIGINT, SIGTERM, SIGQUIT};
static void stops_set(sigset_t *set)
{
sigemptyset(set);
for (size_t i = 0; i < sizeof(stop_signals) / sizeof(stop_signals[0]); ++i)
sigaddset(set, stop_signals[i]);
}
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;
stops_set(&set);
return signal_set(&set, NULL);
}
int signal_restore(const sigset_t *new)
{
return signal_set(new, NULL);
}
int signalfd_create(const sigset_t *set)
{
sigset_t old;
int ret = 0;
ret = signal_set(set, &old);
if (ret < 0)
return ret;
ret = signalfd(-1, set, SFD_CLOEXEC);
if (ret < 0)
goto restore;
return ret;
restore:
signal_set(&old, NULL);
return ret;
}
int signalfd_listen_for_stops(void)
{
sigset_t set;
stops_set(&set);
return signalfd_create(&set);
}
void signalfd_destroy(int fd)
{
file_close(fd);
}
int signalfd_add_to_event_loop(int fd, struct event_loop *loop, event_handler handler, void *arg)
{
return event_loop_add(loop, fd, POLLIN, handler, arg);
}
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