.\"	$NetBSD: pw_lock.3,v 1.14 2010/05/05 22:05:31 wiz Exp $
.\"
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.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
.\" BG 91-66 and contributed to Berkeley.
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.Dd February 17, 2007
.Dt PW_LOCK 3
.Os
.Sh NAME
.Nm pw_lock ,
.Nm pw_mkdb ,
.Nm pw_abort ,
.Nm pw_setprefix ,
.Nm pw_getprefix
.Nd passwd file update functions
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In util.h
.Ft int
.Fn pw_lock "int retries"
.Ft int
.Fn pw_mkdb "const char *username" "int secureonly"
.Ft void
.Fn pw_abort "void"
.Ft int
.Fn pw_setprefix "const char *new_prefix"
.Ft "const char *"
.Fn pw_getprefix "void"
.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 .
If
.Fn pw_mkdb
fails and you do not wish to retry, you should make sure to call
.Fn pw_abort
to clean up the lock file.
If the
.Ar username
argument is not
.Dv NULL ,
only database entries pertaining to the specified user
will be modified.
If the
.Ar secureonly
argument is non-zero, only the secure database will be updated.
.Pp
The
.Fn pw_abort
function aborts a passwd file update by deleting
.Pa /etc/ptmp .
The passwd database remains unchanged.
.Pp
The
.Fn pw_setprefix
function defines the root directory used for passwd file updates.
If the prefix is set to
.Pa /newroot
.Fn pw_lock
will operate on
.Pa /newroot/etc/ptmp
afterwards.
The default prefix is an empty string.
.Pp
The
.Fn pw_getprefix
function returns the root directory which is currently used for passwd file
updates.
.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 ,
.Xr pwd_mkdb 8