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.\" @(#)pwcache.3 5.4 (Berkeley) 4/19/91 33.\" 34.Dd April 19, 1991 35.Dt PWCACHE 3 36.Os 37.Sh NAME 38.Nm pwcache 39.Nd cache password and group entries 40.Sh SYNOPSIS 41.Fn user_from_uid "uid_t uid" "int nouser" 42.Fn group_from_gid "gid_t gid" "int nogroup" 43.Sh DESCRIPTION 44.Bf -symbolic 45This interface is not part of the C library. 46It has been placed in the Berkeley utility library, libutil, as it is 47used by several standard utilities. 48.Ef 49.Pp 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 an 62.Tn ASCII 63representation of the 64.Fa uid , 65unless the argument 66.Fa nouser 67is non-zero, in which case a 68.Dv NULL 69pointer is returned. 70.Pp 71The 72.Fn group_from_gid 73function returns the group name associated with the argument 74.Fa gid . 75The group name is cached so that multiple calls with the same 76.Fa gid 77do not require additional calls to 78.Xr getgrgid 3 . 79If there is no group associated with the 80.Fa gid , 81a pointer is returned 82to an 83.Tn ASCII 84representation of the 85.Fa gid , 86unless the argument 87.Fa nogroup 88is non-zero, in which case a 89.Dv NULL 90pointer is returned. 91.Sh SEE ALSO 92.Xr getgrgid 3 , 93.Xr getpwuid 3 94.Sh HISTORY 95The 96.Fn user_from_id 97and 98.Fn group_from_id 99functions are 100.Ud . 101