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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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daemon.c - implementation of daemon() for systems that lack it
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Copyright (C) 2002, 2003, 2008 Arthur de Jong
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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#include "daemon.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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int daemon(int nochdir,int noclose)
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{
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/* change directory */
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if (!nochdir)
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if (chdir("/")!=0)
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return -1;
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/* fork() and exit() to detach from the parent process */
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switch (fork())
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{
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case 0: /* we are the child */
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break;
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case -1: /* we are the parent, but have an error */
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return -1;
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default: /* we are the parent and we're done*/
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_exit(0);
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}
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/* become process leader */
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if (setsid()<0)
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{
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return -1;
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}
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/* fork again so we cannot allocate a pty */
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switch (fork())
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{
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case 0: /* we are the child */
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break;
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case -1: /* we are the parent, but have an error */
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return -1;
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default: /* we are the parent and we're done*/
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_exit(0);
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}
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/* close stdin, stdout and stderr and reconnect to /dev/null */
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if (!noclose)
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{
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close(0); /* stdin */
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close(1); /* stdout */
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close(2); /* stderr */
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open("/dev/null",O_RDWR); /* stdin, fd=0 */
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dup(0); /* stdout, fd=1 */
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dup(0); /* stderr, fd=2 */
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}
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return 0;
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}
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