mirror of
https://github.com/badaix/snapcast.git
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111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/***
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This file is part of snapcast
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Copyright (C) 2014-2016 Johannes Pohl
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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 3 of the License, or
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(at your option) any later version.
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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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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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#ifndef DAEMONIZE_H
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#define DAEMONIZE_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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#include <syslog.h>
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#include <unistd.h>
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#include <string.h>
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int pidFilehandle;
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void daemonize(const char *pidfile)
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{
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/* Our process ID and Session ID */
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pid_t pid, sid;
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/* Fork off the parent process */
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pid = fork();
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if (pid < 0)
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exit(EXIT_FAILURE);
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/* If we got a good PID, then
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we can exit the parent process. */
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if (pid > 0)
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exit(EXIT_SUCCESS);
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/* Change the file mode mask */
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umask(0);
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/* Open any logs here */
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/* Create a new SID for the child process */
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sid = setsid();
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if (sid < 0)
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{
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Change the current working directory */
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if ((chdir("/")) < 0)
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{
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Ensure only one copy */
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pidFilehandle = open(pidfile, O_RDWR|O_CREAT, 0600);
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if (pidFilehandle == -1 )
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{
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/* Couldn't open lock file */
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syslog(LOG_INFO, "Could not open PID lock file %s, exiting", pidfile);
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exit(EXIT_FAILURE);
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}
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/* Try to lock file */
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if (lockf(pidFilehandle,F_TLOCK,0) == -1)
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{
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/* Couldn't get lock on lock file */
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syslog(LOG_INFO, "Could not lock PID lock file %s, exiting", pidfile);
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exit(EXIT_FAILURE);
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}
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char str[10];
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/* Get and format PID */
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sprintf(str, "%d\n", getpid());
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/* write pid to lockfile */
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if (write(pidFilehandle, str, strlen(str)) != (int)strlen(str))
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{
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/* Couldn't get lock on lock file */
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syslog(LOG_INFO, "Could write PID to lock file %s, exiting", pidfile);
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exit(EXIT_FAILURE);
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}
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/* Close out the standard file descriptors */
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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}
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void daemonShutdown()
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{
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close(pidFilehandle);
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}
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#endif
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