mirror of https://gerrit.osmocom.org/libosmocore
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Process handling support code */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program 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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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int osmo_daemonize(void)
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{
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int rc;
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pid_t pid, sid;
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/* Check if parent PID == init, in which case we are already a daemon */
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if (getppid() == 1)
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return -EEXIST;
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/* Fork from the parent process */
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pid = fork();
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if (pid < 0) {
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/* some error happened */
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return pid;
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}
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if (pid > 0) {
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/* if we have received a positive PID, then we are the parent
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* and can exit */
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exit(0);
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}
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/* FIXME: do we really want this? */
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umask(0);
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/* Create a new session and set process group ID */
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sid = setsid();
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if (sid < 0)
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return sid;
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/* Change to the /tmp directory, which prevents the CWD from being locked
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* and unable to remove it */
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rc = chdir("/tmp");
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if (rc < 0)
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return rc;
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/* Redirect stdio to /dev/null */
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/* since C89/C99 says stderr is a macro, we can safely do this! */
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#ifdef stderr
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freopen("/dev/null", "r", stdin);
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freopen("/dev/null", "w", stdout);
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freopen("/dev/null", "w", stderr);
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#endif
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return 0;
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}
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