1.\" Copyright (c) 1989, 1991, 1993 2.\" The Regents of the University of California. 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.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD: src/lib/libc/gen/pwcache.3,v 1.6.2.4 2001/12/14 18:33:51 ru Exp $ 34.\" 35.Dd June 9, 1993 36.Dt PWCACHE 3 37.Os 38.Sh NAME 39.Nm pwcache 40.Nd cache password and group entries 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In stdlib.h 45.Ft char * 46.Fn user_from_uid "unsigned long uid" "int nouser" 47.Ft char * 48.Fn group_from_gid "unsigned long gid" "int nogroup" 49.Sh DESCRIPTION 50The 51.Fn user_from_uid 52function returns the user name associated with the argument 53.Fa uid . 54The user name is cached so that multiple calls with the same 55.Fa uid 56do not require additional calls to 57.Xr getpwuid 3 . 58If there is no user associated with the 59.Fa uid , 60a pointer is returned 61to a string representation of the 62.Fa uid , 63unless the argument 64.Fa nouser 65is non-zero, in which case a 66.Dv NULL 67pointer is returned. 68.Pp 69The 70.Fn group_from_gid 71function returns the group name associated with the argument 72.Fa gid . 73The group name is cached so that multiple calls with the same 74.Fa gid 75do not require additional calls to 76.Xr getgrgid 3 . 77If there is no group associated with the 78.Fa gid , 79a pointer is returned 80to a string representation of the 81.Fa gid , 82unless the argument 83.Fa nogroup 84is non-zero, in which case a 85.Dv NULL 86pointer is returned. 87.Sh SEE ALSO 88.Xr getgrgid 3 , 89.Xr getpwuid 3 90.Sh HISTORY 91The 92.Fn user_from_uid 93and 94.Fn group_from_gid 95functions first appeared in 96.Bx 4.4 . 97