1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libutil/pidfile.3 b/lib/libutil/pidfile.3
new file mode 100644
index 00000000000..d1e4be08797
--- /dev/null
+++ b/lib/libutil/pidfile.3
@@ -0,0 +1,77 @@
+.\"	$OpenBSD: pidfile.3,v 1.1 2001/09/28 20:16:42 jakob Exp $
+.\"	$NetBSD: pidfile.3,v 1.2 2001/04/12 22:34:31 sommerfeld Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd June 5, 1999
+.Dt PIDFILE 3
+.Os
+.Sh NAME
+.Nm pidfile
+.Nd write a daemon pid file
+.Sh SYNOPSIS
+.Fd #include <util.h>
+.Ft int
+.Fn pidfile "const char *basename"
+.Sh DESCRIPTION
+.Fn pidfile
+writes a file containing the process ID of the program to the
+.Pa /var/run
+directory.  The file name has the form
+.Pa /var/run/basename.pid .
+If the
+.Ar basename
+argument is NULL,
+.Nm
+will determine the program name and use that instead.
+.Pp
+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.
+.Pp
+Note that only the first invocation of
+.Nm
+causes a pid file to be written; subsequent invocations have no effect.
+.Sh RETURN VALUES
+.Fn pidfile
+returns 0 on success and -1 on failure.
+.Sh SEE ALSO
+.Xr atexit 3
+.Sh HISTORY
+The
+.Nm
+function call appeared in
+.Ox 3.0 .