1.\" $NetBSD: getuid.2,v 1.12 2002/04/29 01:41:45 simonb Exp $ 2.\" 3.\" Copyright (c) 1980, 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.\" @(#)getuid.2 8.1 (Berkeley) 6/4/93 35.\" 36.Dd June 4, 1993 37.Dt GETUID 2 38.Os 39.Sh NAME 40.Nm getuid , 41.Nm geteuid 42.Nd get user identification 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.Fd #include \*[Lt]unistd.h\*[Gt] 47.Ft uid_t 48.Fn getuid void 49.Ft uid_t 50.Fn geteuid void 51.Sh DESCRIPTION 52The 53.Fn getuid 54function returns the real user ID of the calling process. 55The 56.Fn geteuid 57function 58returns the effective user ID of the calling process. 59.Pp 60The real user ID is that of the user who has invoked the program. 61As the effective user ID 62gives the process additional permissions during 63execution of 64.Dq Em set-user-ID 65mode processes, 66.Fn getuid 67is used to determine the real-user-id of the calling process. 68.Sh ERRORS 69The 70.Fn getuid 71and 72.Fn geteuid 73functions are always successful, and no return value is reserved to 74indicate an error. 75.Sh SEE ALSO 76.Xr getgid 2 , 77.Xr setreuid 2 78.Sh STANDARDS 79The 80.Fn geteuid 81and 82.Fn getuid 83functions conform to 84.St -p1003.1-90 . 85