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daemon.c
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C/C++ Source or Header
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1995-06-22
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2KB
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90 lines
/*
* xdm - display manager daemon
*
* $XConsortium: daemon.c,v 1.8 91/05/11 15:37:38 gildea 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 <X11/Xos.h>
#ifdef SVR4
#include <termios.h>
#else
#include <sys/ioctl.h>
#endif
#ifdef hpux
#include <sys/ptyio.h>
#endif
extern void exit ();
BecomeOrphan ()
{
/*
* 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 (fork ())
exit (0);
}
BecomeDaemon ()
{
register int i;
/*
* Close standard file descriptors and get rid of controlling tty
*/
#if defined(SYSV) || defined(SVR4)
setpgrp ();
#else
setpgrp (0, getpid());
#endif
close (0);
close (1);
close (2);
#if defined(sco)
#define SYSV386
#endif
#ifndef SYSV386
if ((i = open ("/dev/tty", O_RDWR)) >= 0) { /* did open succeed? */
#if (defined(SYSV) || defined(SVR4)) && defined(TIOCTTY)
int zero = 0;
(void) ioctl (i, TIOCTTY, &zero);
#else
#ifndef CRAY
(void) ioctl (i, TIOCNOTTY, (char *) 0); /* detach, BSD style */
#endif
#endif
(void) close (i);
}
#endif /* !SYSV386 */
/*
* Set up the standard file descriptors.
*/
(void) open ("/", O_RDONLY); /* root inode already in core */
(void) dup2 (0, 1);
(void) dup2 (0, 2);
}