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79 lines
2.2 KiB
79 lines
2.2 KiB
15 years ago
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/*
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Copyright 1988, 1998 The Open Group
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Copyright 2000,2001,2003 Oswald Buddenhagen <ossi@kde.org>
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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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.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of a copyright holder shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the copyright holder.
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*/
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/*
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* xdm - display manager daemon
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* Author: Keith Packard, MIT X Consortium
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*/
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#include "dm.h"
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#include "dm_error.h"
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void
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BecomeDaemon( void )
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{
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int pfd[2];
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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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* Create a pipe and block on it, so the parent knows when the child is
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* done with detaching. This eliminates the possibility that the child
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* might get killed when the init script that's running xdm exits.
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*/
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if (pipe( pfd ))
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pfd[0] = pfd[1] = -1; /* so what ...? */
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switch (fork ()) {
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case 0:
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/* child */
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break;
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case -1:
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/* error */
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LogError( "Daemon fork failed: %m\n" );
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break;
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default:
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/* parent */
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close( pfd[1] );
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read( pfd[0], &pfd[1] /* dummy */, 1 );
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exit( 0 );
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}
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/* don't use daemon() - it doesn't buy us anything but an additional fork */
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setsid();
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close( pfd[0] );
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close( pfd[1] ); /* tell parent that we're done with detaching */
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chdir( "/" );
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}
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