90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* *
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* (c) Copyright 1993, 1994 Hewlett-Packard Company *
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* (c) Copyright 1993, 1994 International Business Machines Corp. *
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* (c) Copyright 1993, 1994 Sun Microsystems, Inc. *
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* (c) Copyright 1993, 1994 Novell, Inc. *
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*/
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/*
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* xdm - display manager daemon
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*
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* $TOG: daemon.c /main/5 1998/04/06 13:21:16 mgreess $
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*
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* Copyright 1988 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. M.I.T. makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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#include <X11/Xos.h>
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#include <sys/ioctl.h>
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#ifdef hpux
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#include <sys/ptyio.h>
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#endif
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#ifdef SVR4
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#include <termio.h>
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#endif
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extern void exit ();
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void
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BecomeDaemon( void )
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{
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register int i;
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/*
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* fork so that the process goes into the background automatically. Also
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* has a nice side effect of having the child process get inherited by
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* init (pid 1).
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*/
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if (fork ()) /* if parent */
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exit (0); /* then no more work to do */
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/*
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* Close standard file descriptors and get rid of controlling tty
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*/
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#ifdef __osf__
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/* use setsid() instead of setpgrp() */
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setsid();
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#else
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#if defined(SYSV) || defined (SVR4) || defined(linux)
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setpgrp ();
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#else
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setpgrp (0, getpid());
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#endif
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#endif /* __osf__ */
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close (0);
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close (1);
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close (2);
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if ((i = open ("/dev/tty", O_RDWR)) >= 0) { /* did open succeed? */
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#if defined(SYSV) && defined(TIOCTTY)
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int zero = 0;
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(void) ioctl (i, TIOCTTY, &zero);
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#else
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(void) ioctl (i, TIOCNOTTY, (char *) 0); /* detach, BSD style */
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#endif
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(void) close (i);
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}
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/*
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* Set up the standard file descriptors.
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*/
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(void) open ("/", O_RDONLY); /* root inode already in core */
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(void) dup2 (0, 1);
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(void) dup2 (0, 2);
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}
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