/*
  *  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; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #ifndef HAVE_DAEMON
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
 #include <stdlib.h>
 
 #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
 
 #include <errno.h>
 
 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)
     {

         if (chdir("/") == -1)
         {
             return (-1);
         }

     }
 
     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  /* if defined(HAVE_FORK) && defined(HAVE_SETSID) */
     (void)nochdir;
     (void)noclose;
     errno = EFAULT;
     return -1;
 #endif /* if defined(HAVE_FORK) && defined(HAVE_SETSID) */

 }
 

 #endif /* ifndef HAVE_DAEMON */