1.\" $NetBSD: getuid.2,v 1.7 1997/07/14 23:20:03 kleink 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 BSD 4 39.Sh NAME 40.Nm getuid , 41.Nm geteuid 42.Nd get user identification 43.Sh SYNOPSIS 44.Fd #include <sys/types.h> 45.Fd #include <unistd.h> 46.Ft uid_t 47.Fn getuid void 48.Ft uid_t 49.Fn geteuid void 50.Sh DESCRIPTION 51The 52.Fn getuid 53function returns the real user ID of the calling process. 54The 55.Fn geteuid 56function 57returns the effective user ID of the calling process. 58.Pp 59The real user ID is that of the user who has invoked the program. 60As the effective user ID 61gives the process additional permissions during 62execution of 63.Dq Em set-user-ID 64mode processes, 65.Fn getuid 66is used to determine the real-user-id of the calling process. 67.Sh ERRORS 68The 69.Fn getuid 70and 71.Fn geteuid 72functions are always successful, and no return value is reserved to 73indicate an error. 74.Sh SEE ALSO 75.Xr getgid 2 , 76.Xr setreuid 2 77.Sh STANDARDS 78The 79.Fn Geteuid 80and 81.Fn getuid 82functions conform to 83.St -p1003.1-90 . 84