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.\"	$NetBSD: pwcache.3,v 1.17 2008/05/02 18:11:04 martin Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" 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. 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.
.\"
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" 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
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.\"
.\"     @(#)pwcache.3	8.1 (Berkeley) 6/9/93
.\"
.Dd January 24, 2002
.Dt PWCACHE 3
.Os
.Sh NAME
.Nm pwcache ,
.Nm user_from_uid ,
.Nm group_from_gid
.Nd cache password and group entries
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In pwd.h
.Ft const char *
.Fn user_from_uid "uid_t uid" "int nouser"
.Ft int
.Fn uid_from_user "const char *name" "uid_t *uid"
.Ft int
.Fn pwcache_userdb "int (*setpassent)(int)" "void (*endpwent)(void)" "struct passwd * (*getpwnam)(const char *)" "struct passwd * (*getpwuid)(uid_t)"
.In grp.h
.Ft const char *
.Fn group_from_gid "gid_t gid" "int nogroup"
.Ft int
.Fn gid_from_group "const char *name" "gid_t *gid"
.Ft int
.Fn pwcache_groupdb "int (*setgroupent)(int)" "void (*endgrent)(void)" "struct group * (*getgrnam)(const char *)" "struct group * (*getgrgid)(gid_t)"
.Sh DESCRIPTION
The
.Fn user_from_uid
function returns the user name associated with the argument
.Fa uid .
The user name is cached so that multiple calls with the same
.Fa uid
do not require additional calls to
.Xr getpwuid 3 .
If there is no user associated with the
.Fa uid ,
a pointer is returned
to a string representation of the
.Fa uid ,
unless the argument
.Fa nouser
is non-zero, in which case a
.Dv NULL
pointer is returned.
.Pp
The
.Fn group_from_gid
function returns the group name associated with the argument
.Fa gid .
The group name is cached so that multiple calls with the same
.Fa gid
do not require additional calls to
.Xr getgrgid 3 .
If there is no group associated with the
.Fa gid ,
a pointer is returned
to a string representation of the
.Fa gid ,
unless the argument
.Fa nogroup
is non-zero, in which case a
.Dv NULL
pointer is returned.
.Pp
The
.Fn uid_from_user
function returns the uid associated with the argument
.Fa name .
The uid is cached so that multiple calls with the same
.Fa name
do not require additional calls to
.Xr getpwnam 3 .
If there is no uid associated with the
.Fa name ,
the
.Fn uid_from_user
function returns \-1; otherwise it stores the uid at the location pointed to by
.Fa uid
and returns 0.
.Pp
The
.Fn gid_from_group
function returns the gid associated with the argument
.Fa name .
The gid is cached so that multiple calls with the same
.Fa name
do not require additional calls to
.Xr getgrnam 3 .
If there is no gid associated with the
.Fa name ,
the
.Fn gid_from_group
function returns \-1; otherwise it stores the gid at the location pointed to by
.Fa gid
and returns 0.
.Pp
The
.Fn pwcache_userdb
function changes the user database access routines which
.Fn user_from_uid
and
.Fn uid_from_user
call to search for users.
The caches are flushed and the existing
.Fn endpwent
method is called before switching to the new routines.
.Fa getpwnam
and
.Fa getpwuid
must be provided, and
.Fa setpassent
and
.Fa endpwent
may be
.Dv NULL
pointers.
.Pp
The
.Fn pwcache_groupdb
function changes the group database access routines which
.Fn group_from_gid
and
.Fn gid_from_group
call to search for groups.
The caches are flushed and the existing
.Fn endgrent
method is called before switching to the new routines.
.Fa getgrnam
and
.Fa getgrgid
must be provided, and
.Fa setgroupent
and
.Fa endgrent
may be
.Dv NULL
pointers.
.Sh SEE ALSO
.Xr getgrgid 3 ,
.Xr getgrnam 3 ,
.Xr getpwnam 3 ,
.Xr getpwuid 3
.Sh HISTORY
The
.Fn user_from_uid
and
.Fn group_from_gid
functions first appeared in
.Bx 4.4 .
.Pp
The
.Fn uid_from_user
and
.Fn gid_from_group
functions first appeared in
.Nx 1.4 .
.Pp
The
.Fn pwcache_userdb
and
.Fn pwcache_groupdb
functions first appeared in
.Nx 1.6 .