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/*
* Copyright (c) 2022 Egor Tensin <egor@tensin.name>
* 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 "file.h"
#include "log.h"
#include <signal.h>
#include <stddef.h>
#include <sys/signalfd.h>
static int sigterm_signals[] = {SIGINT, SIGTERM, SIGQUIT};
static void sigterms_mask(sigset_t* set) {
sigemptyset(set);
for (size_t i = 0; i < sizeof(sigterm_signals) / sizeof(sigterm_signals[0]); ++i)
sigaddset(set, sigterm_signals[i]);
}
static int signal_set_mask_internal(const sigset_t* new, sigset_t* old) {
int ret = 0;
ret = pthread_sigmask(SIG_SETMASK, new, old);
if (ret) {
pthread_errno(ret, "pthread_sigmask");
return ret;
}
return ret;
}
int signal_set_mask(const sigset_t* new) {
return signal_set_mask_internal(new, NULL);
}
int signal_block_all(sigset_t* old) {
sigset_t new;
sigfillset(&new);
return signal_set_mask_internal(&new, old);
}
int signal_block_sigterms(void) {
sigset_t set;
sigterms_mask(&set);
return signal_set_mask_internal(&set, NULL);
}
int signalfd_create(const sigset_t* set) {
static const int flags = SFD_CLOEXEC;
sigset_t old;
int ret = 0;
ret = signal_set_mask_internal(set, &old);
if (ret < 0)
return ret;
ret = signalfd(-1, set, flags);
if (ret < 0)
goto restore;
return ret;
restore:
signal_set_mask_internal(&old, NULL);
return ret;
}
int signalfd_create_sigterms(void) {
sigset_t set;
sigterms_mask(&set);
return signalfd_create(&set);
}
void signalfd_destroy(int fd) {
file_close(fd);
}
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