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/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2018 Wireguard LLC
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
void daemonize(void) {
pid_t pid;
/* fork */
pid = fork();
/* check fork for error */
if (pid < 0) {
perror("fork error");
exit(EXIT_FAILURE);
}
/* terminate the parent */
if (pid > 0) {
exit(EXIT_SUCCESS);
}
/* become session leader */
if (setsid() < 0) {
perror("setsid error");
exit(EXIT_FAILURE);
}
/* fork */
pid = fork();
/* check fork for error */
if (pid < 0) {
perror("fork error");
exit(EXIT_FAILURE);
}
/* terminate the parent */
if (pid > 0) {
exit(EXIT_SUCCESS);
}
/* set up new environment */
umask(S_IRWXG | S_IRWXO); /* umask 077 */
chdir("/"); /* cd / to avoid locking up original cwd */
/* close file descriptors */
for (int fd = sysconf(_SC_OPEN_MAX); fd >=0; fd--) {
close(fd);
}
}
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