/*
* Soft: Keepalived is a failover program for the LVS project
* <www.linuxvirtualserver.org>. It monitor & manipulate
* a loadbalanced server pool using multi-layer checks.
*
* Part: Main program structure.
*
* Author: Alexandre Cassen, <acassen@linux-vs.org>
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 2001-2017 Alexandre Cassen, <acassen@gmail.com>
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include "daemon.h"
#include "logger.h"
#include "utils.h"
/* Daemonization function coming from zebra source code */
pid_t
xdaemon(bool nochdir, bool noclose, bool exitflag)
{
pid_t pid;
int ret;
#ifdef ENABLE_LOG_TO_FILE
if (log_file_name)
flush_log_file();
#endif
/* In case of fork is error. */
pid = fork();
if (pid < 0) {
log_message(LOG_INFO, "xdaemon: fork error");
return -1;
}
/* In case of this is parent process. */
if (pid != 0) {
if (!exitflag)
exit(0);
else
return pid;
}
/* Become session leader and get pid. */
pid = setsid();
if (pid < -1) {
log_message(LOG_INFO, "xdaemon: setsid error");
return -1;
}
/* Change directory to root. */
if (!nochdir) {
ret = chdir("/");
if (ret < 0) {
log_message(LOG_INFO, "xdaemon: chdir error");
}
}
/* File descriptor close. */
if (!noclose)
set_std_fd(true);
return 0;
}