81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* disassoc.c: Boilerplate daemonization code
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*
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* Known contributors to this file:
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* Doug Hay, 1998
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* Markus Armbruster, 2005
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*/
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/*
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* See W. Richard Stevens: UNIX Network Programming, Vol. 1
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*/
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#include <config.h>
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#ifndef _WIN32
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#include <fcntl.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "prototypes.h"
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int
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disassoc(void)
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{
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pid_t pid;
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int i;
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if ((pid = fork()) < 0)
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return -1;
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else if (pid)
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_exit(0); /* parent */
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/* Become session leader of new session, lose controlling tty */
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if (setsid() < 0)
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return -1;
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/* Lose session leader status, so we can't acquire a controlling tty */
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if ((pid = fork()) < 0)
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return -1;
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else if (pid)
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_exit(0); /* parent */
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/* Note: no controlling tty, therefore no SIGHUP sent */
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/* datadir is working directory, that's fine */
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/* We opened a bunch of files already, so just close 0..2 */
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for (i = 0; i < 3; i++)
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close(i);
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/* Library code may use 0..2; make sure that's safe */
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open("/dev/null", O_RDWR);
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dup(0);
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dup(0);
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return 0;
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}
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#endif
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