/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    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.

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to <crossfire@schmorp.de>
*/

/*
 * BecomeDaemon.c
 * shamelessly swiped from xdm source code.
 * Appropriate copyrights kept, and hereby follow
 * ERic mehlhaff, 3/11/92
 *
 * xdm - display manager daemon
 *
 * $XConsortium: daemon.c,v 1.5 89/01/20 10:43:49 jim Exp $
 *
 * Copyright 1988 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  M.I.T. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * Author:  Keith Packard, MIT X Consortium
 */


#include <global.h>
#ifndef __CEXTRACT__
# include <sproto.h>
#endif
#include <sys/ioctl.h>
#ifdef hpux
# include <sys/ptyio.h>
#endif

#include <errno.h>
#include <stdio.h>
#include <sys/file.h>

FILE * BecomeDaemon (const char *filename)
{
  FILE *logfile;
  int forkresult;

  if ((logfile = fopen (filename, "a")) == NULL)
    {
      fprintf (stderr, "Couldn't create logfile %s: %s\n", filename, strerror (errno));
      exit (0);
    }
  fputs ("\n========================\n", logfile);
  fputs ("Begin New Server Session\n", logfile);
  fputs ("========================\n\n", logfile);
  fflush (logfile);
  /*
   * fork so that the process goes into the background automatically. Also
   * has a nice side effect of having the child process get inherited by
   * init (pid 1).
   */

  if ((forkresult = fork ()))
    {                           /* if parent */
      if (forkresult < 0)
        {
          perror ("Fork error!");
        }
      exit (0);                 /* then no more work to do */
    }

  /*
   * Close standard file descriptors and get rid of controlling tty
   */

  close (0);
  close (1);
  close (2);

  /*
   * Set up the standard file descriptors.
   */
  (void) open ("/", O_RDONLY);  /* root inode already in core */
  (void) dup2 (0, 1);
  (void) dup2 (0, 2);

  setsid ();
  return (logfile);
}