/*
 * static char *rcsid_daemon_c =
 *   "$Id: daemon.c,v 1.5 2002/03/20 06:27:46 mwedel Exp $";
 */

/*
    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-devel@real-time.com
*/

/*
 * 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 (char *filename)
{
  FILE *logfile;
  register int i;
  int forkresult;
 
  if((logfile=fopen(filename,"a"))==NULL){
    printf("Couldn't create logfile %s.\n",filename);
    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);

    if ((i = open ("/dev/tty", O_RDWR)) >= 0) {	/* did open succeed? */
#if (defined(SYSV) || defined(hpux)) && defined(TIOCTTY)
	int zero = 0;
	(void) ioctl (i, TIOCTTY, &zero);
#else

#  ifdef HAVE_SYS_TERMIOS_H
#    include <sys/termios.h>
#  else
#    ifdef HAVE_SYS_TTYCOM_H
#      include <sys/ttycom.h>
#    endif
#  endif
	(void) ioctl (i, TIOCNOTTY, (char *) 0);    /* detach, BSD style */
#endif
	(void) close (i);
    }


#ifdef HAVE_SETSID
    setsid();
#else
/* Are these really different?  */
#  if defined(SYSV) || defined(SVR4)
      setpgrp (0, 0);
#  else /* Non SYSV machines */
      setpgrp (0, getpid());
#  endif
#endif
  return(logfile);
}
