/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2011 - David Sommerseth <davids@redhat.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif

#ifndef HAVE_DAEMON

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

int
daemon(int nochdir, int noclose)
{
#if defined(HAVE_FORK) && defined(HAVE_SETSID)
	switch (fork()) {
		case -1:
			return (-1);
		case 0:
		break;
		default:
			exit(0);
	}

	if (setsid() == -1)
		return (-1);

	if (!nochdir)
		chdir("/");

	if (!noclose) {
#if defined(HAVE_DUP) && defined(HAVE_DUP2)
		int fd;
		if ((fd = open ("/dev/null", O_RDWR, 0)) != -1) {
			dup2 (fd, 0);
			dup2 (fd, 1);
			dup2 (fd, 2);
			if (fd > 2) {
				close (fd);
			}
		}
#endif
	}

	return 0;
#else
	(void)nochdir;
	(void)noclose;
	errno = EFAULT;
	return -1;
#endif
}

#endif