1.\" Copyright (c) 1989, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)pwcache.3 5.4 (Berkeley) 4/19/91 33.\" $Id: pwcache.3,v 1.2 1993/08/01 07:40:35 mycroft Exp $ 34.\" 35.Dd April 19, 1991 36.Dt PWCACHE 3 37.Os 38.Sh NAME 39.Nm pwcache 40.Nd cache password and group entries 41.Sh SYNOPSIS 42.Fn user_from_uid "uid_t uid" "int nouser" 43.Fn group_from_gid "gid_t gid" "int nogroup" 44.Sh DESCRIPTION 45.Bf -symbolic 46This interface is not part of the C library. 47It has been placed in the Berkeley utility library, libutil, as it is 48used by several standard utilities. 49.Ef 50.Pp 51The 52.Fn user_from_uid 53function returns the user name associated with the argument 54.Fa uid . 55The user name is cached so that multiple calls with the same 56.Fa uid 57do not require additional calls to 58.Xr getpwuid 3 . 59If there is no user associated with the 60.Fa uid , 61a pointer is returned 62to an 63.Tn ASCII 64representation of the 65.Fa uid , 66unless the argument 67.Fa nouser 68is non-zero, in which case a 69.Dv NULL 70pointer is returned. 71.Pp 72The 73.Fn group_from_gid 74function returns the group name associated with the argument 75.Fa gid . 76The group name is cached so that multiple calls with the same 77.Fa gid 78do not require additional calls to 79.Xr getgrgid 3 . 80If there is no group associated with the 81.Fa gid , 82a pointer is returned 83to an 84.Tn ASCII 85representation of the 86.Fa gid , 87unless the argument 88.Fa nogroup 89is non-zero, in which case a 90.Dv NULL 91pointer is returned. 92.Sh SEE ALSO 93.Xr getgrgid 3 , 94.Xr getpwuid 3 95.Sh HISTORY 96The 97.Fn user_from_id 98and 99.Fn group_from_id 100functions are 101.Ud . 102