PIDFILE(3) BSD Programmer's Manual PIDFILE(3)NAMEpidfile - write a daemon pid file
SYNOPSIS
#include <util.h>
int
pidfile(const char *basename);
DESCRIPTIONpidfile() 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, pidfile will 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 au-
tomatically, unless the program receives a fatal signal.
RETURN VALUESpidfile() returns 0 on success and -1 on failure.
SEE ALSOatexit(3)HISTORY
The pidfile function call appeared in OpenBSD 3.0.
CAVEATS
If pidfile() is called multiple times with different basename, only the
last pidfile will be removed upon exit.
pidfile() uses atexit() to ensure the pidfile is unlinked at program
exit. However, programs that use the _exit() function (for example, in
signal handlers) will not trigger this behaviour.
MirOS BSD #10-current June 5, 1999 1