|PIDFILE(3)||Library Functions Manual||PIDFILE(3)|
pidfile() writes a file containing the process ID of the program to the /var/run directory. The file name has the form /var/run/basename.pid. If the basename argument is NULL,
pidfilewill determine the program name and use that instead.
The pid file can be used as a quick reference if the process needs to be sent a signal. When the program exits, the pid file will be removed automatically, unless the program receives a fatal signal.
pidfile() returns 0 on success and -1 on failure. atexit(3)
pidfilefunction call appeared in OpenBSD 3.0.
pidfile() is called multiple times with different basename, only the last pidfile will be removed upon exit.
atexit() to ensure the pidfile is unlinked at
program exit. However, programs that use the
function (for example, in signal handlers) will not trigger this
|June 5, 2013||OpenBSD-current|