/*

 * 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;

}