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+.\"	$OpenBSD: pwcache.3,v 1.15 2018/09/13 16:50:54 jmc 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.
+.\"
+.Dd $Mdocdate: September 13 2018 $
+.Dt USER_FROM_UID 3
+.Os
+.Sh NAME
+.Nm user_from_uid ,
+.Nm uid_from_user ,
+.Nm group_from_gid ,
+.Nm gid_from_group
+.Nd cache password and group entries
+.Sh LIBRARY
+.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
+.ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
+.Lb libbsd
+.Sh SYNOPSIS
+.In pwd.h
+(See
+.Xr libbsd 7
+for include usage.)
+.Ft int
+.Fn uid_from_user "const char *name" "uid_t *uid"
+.Ft const char *
+.Fn user_from_uid "uid_t uid" "int nouser"
+.In grp.h
+.Ft int
+.Fn gid_from_group "const char *name" "gid_t *gid"
+.Ft const char *
+.Fn group_from_gid "gid_t gid" "int nogroup"
+.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 null pointer is returned.
+.Pp
+The
+.Fn uid_from_user
+function returns the user ID associated with the argument
+.Fa name .
+The user ID is cached so that multiple calls with the same
+.Fa name
+do not require additional calls to
+.Xr getpwnam 3 .
+If there is no user ID associated with the
+.Fa name ,
+the
+.Fn uid_from_user
+function returns -1;
+otherwise it stores the user ID at the location pointed to by
+.Fa uid
+and returns 0.
+.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 null pointer is returned.
+.Pp
+The
+.Fn gid_from_group
+function returns the group ID associated with the argument
+.Fa name .
+The group ID is cached so that multiple calls with the same
+.Fa name
+do not require additional calls to
+.Xr getgrnam 3 .
+If there is no group ID associated with the
+.Fa name ,
+the
+.Fn gid_from_group
+function returns -1;
+otherwise it stores the group ID at the location pointed to by
+.Fa gid
+and returns 0.
+.Sh SEE ALSO
+.Xr getgrgid 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 were ported from
+.Nx
+and first appeared in
+.Ox 6.4 .