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+.\" Copyright (c) 1995
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software developed by the Computer Systems
+.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
+.\" BG 91-66 and contributed to Berkeley.
+.\"
+.\" 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 University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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 December 15, 1995
+.Dt PW_LOCK 3
+.Os
+.Sh NAME
+.Nm pw_lock ,
+.Nm pw_mkdb ,
+.Nm pw_abort
+.Nd passwd file update functions
+.Sh SYNOPSIS
+.Fd #include <util.h>
+.Ft int
+.Fn pw_lock "int retries"
+.Ft int
+.Fn pw_mkdb
+.Ft void
+.Fn pw_abort
+.Sh DESCRIPTION
+The
+.Fn pw_lock ,
+.Fn pw_mkdb ,
+and
+.Fn pw_abort
+functions allow a program to update the system passwd database.
+.Pp
+The
+.Fn pw_lock
+function attempts to lock the passwd database by creating the file
+.Pa /etc/ptmp ,
+and returns the file descriptor of that file.  If
+.Fa retries
+is greater than zero,
+.Fn pw_lock
+will try multiple times to open
+.Pa /etc/ptmp ,
+waiting one second between tries.  In addition to being a lock file,
+.Pa /etc/ptmp
+will also hold the contents of the new passwd file.
+.Pp
+The
+.Fn pw_mkdb
+function updates the passwd file from the contents of
+.Pa /etc/ptmp .
+You should finish writing to and close the file descriptor returned by
+.Fn pw_lock
+before calling
+.Fn pw_mkdb .
+.Pp
+The
+.Fn pw_abort
+function aborts a passwd file update by deleting
+.Pa /etc/ptmp .
+The passwd database remains unchanged.
+.Sh RETURN VALUES
+The
+.Fn pw_lock
+and
+.Fn pw_mkdb
+functions return -1 if they are unable to complete properly.
+.Sh FILES
+.Bl -tag -width /etc/master.passwd -compact
+.It Pa /etc/master.passwd
+.It Pa /etc/ptmp
+.El
+.Sh SEE ALSO
+.Xr pw_init 3