1.\" Copyright (c) 1983, 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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)setruid.3 8.1 (Berkeley) 6/2/93 29.\" $FreeBSD: src/lib/libc/compat-43/setruid.3,v 1.5.2.5 2001/12/14 18:33:49 ru Exp $ 30.\" $DragonFly: src/lib/libc/compat-43/setruid.3,v 1.3 2006/02/17 19:35:06 swildner Exp $ 31.\" 32.Dd June 2, 1993 33.Dt SETRUID 3 34.Os 35.Sh NAME 36.Nm setruid , 37.Nm setrgid 38.Nd set user and group ID 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In unistd.h 43.Ft int 44.Fn setruid "uid_t ruid" 45.Ft int 46.Fn setrgid "gid_t rgid" 47.Sh DESCRIPTION 48The 49.Fn setruid 50function 51.Pq Fn setrgid 52sets the real user ID (group ID) of the 53current process. 54.Sh RETURN VALUES 55.Rv -std 56.Sh COMPATIBILITY 57The use of these calls is not portable. 58Their use is discouraged; they will be removed in the future. 59.Sh ERRORS 60The functions fail if: 61.Bl -tag -width Er 62.It Bq Er EPERM 63The user is not the super user and the ID 64specified is not the real or effective ID. 65.El 66.Sh SEE ALSO 67.Xr getgid 2 , 68.Xr getuid 2 , 69.Xr setegid 2 , 70.Xr seteuid 2 , 71.Xr setgid 2 , 72.Xr setuid 2 73.Sh HISTORY 74The 75.Fn setruid 76and 77.Fn setrgid 78syscalls appeared in 79.Bx 4.2 80and were dropped in 81.Bx 4.4 . 82