1.\" $NetBSD: pwcache.3,v 1.4 1995/02/27 04:35:44 cgd Exp $ 2.\" 3.\" Copyright (c) 1989, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93 35.\" 36.Dd June 9, 1993 37.Dt PWCACHE 3 38.Os 39.Sh NAME 40.Nm pwcache 41.Nd cache password and group entries 42.Sh SYNOPSIS 43.Fn user_from_uid "uid_t uid" "int nouser" 44.Fn group_from_gid "gid_t gid" "int nogroup" 45.Sh DESCRIPTION 46The 47.Fn user_from_uid 48function returns the user name associated with the argument 49.Fa uid . 50The user name is cached so that multiple calls with the same 51.Fa uid 52do not require additional calls to 53.Xr getpwuid 3 . 54If there is no user associated with the 55.Fa uid , 56a pointer is returned 57to a string representation of the 58.Fa uid , 59unless the argument 60.Fa nouser 61is non-zero, in which case a 62.Dv NULL 63pointer is returned. 64.Pp 65The 66.Fn group_from_gid 67function returns the group name associated with the argument 68.Fa gid . 69The group name is cached so that multiple calls with the same 70.Fa gid 71do not require additional calls to 72.Xr getgrgid 3 . 73If there is no group associated with the 74.Fa gid , 75a pointer is returned 76to a string representation of the 77.Fa gid , 78unless the argument 79.Fa nogroup 80is non-zero, in which case a 81.Dv NULL 82pointer is returned. 83.Sh SEE ALSO 84.Xr getgrgid 3 , 85.Xr getpwuid 3 86.Sh HISTORY 87The 88.Fn user_from_id 89and 90.Fn group_from_id 91functions first appeared in 4.4BSD. 92