kayprish/timeoutd
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Add error checks and fork() call after setsid()

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In order to start a daemon, a second call for fork() after changing
session ID is usually required, in order to prevent acquiring a
controlling tty when it eventually writes to one.
This commit is contained in:
Petar Kapris 2020-12-06 19:51:37 +01:00
parent e4c67052ef
commit 06c238d486
1 changed files with 27 additions and 3 deletions
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30
timeoutd.c
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@ -340,13 +340,37 @@ char *argv[];
} }
/* If running in daemon mode (no parameters) */ /* If running in daemon mode (no parameters) */
if (fork()) /* the parent process */ pid_t pid;
exit(0); /* exits */
if ((pid = fork()) < 0) {
openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON);
syslog(LOG_ERR, "Failed to execute fork number 1");
closelog();
exit(1);
}
if (pid > 0)
exit(0);
close(0); close(0);
close(1); close(1);
close(2); close(2);
setsid(); if (setsid() < 0) {
openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON);
syslog(LOG_ERR, "Failed to set new session ID at startup.");
closelog();
exit(1);
}
if ((pid = fork()) < 0) {
openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON);
syslog(LOG_ERR, "Failed to execute fork number 2");
closelog();
exit(1);
}
if (pid > 0)
exit(0);
umask(0);
openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON); openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON);
syslog(LOG_NOTICE, "Daemon started."); syslog(LOG_NOTICE, "Daemon started.");