1.\" Copyright (c) 1980, 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.\" from: @(#)setreuid.2 6.4 (Berkeley) 3/10/91 33.\" $Id: setreuid.2,v 1.4 1993/11/29 21:25:36 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SETREUID 2 37.Os BSD 4 38.Sh NAME 39.Nm setreuid 40.Nd set real and effective user ID's 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft int 44.Fn setreuid "int ruid" "int euid" 45.Sh DESCRIPTION 46The real and effective user ID's of the 47current process are set according to the arguments. 48If 49.Fa ruid 50or 51.Fa euid 52is -1, the current uid is filled in by the system. 53Unprivileged users may change the real user 54ID to the effective user ID and vice-versa; only the super-user may 55make other changes. 56.Sh RETURN VALUES 57Upon successful completion, a value of 0 is returned. Otherwise, 58a value of -1 is returned and 59.Va errno 60is set to indicate the error. 61.Sh ERRORS 62.Bl -tag -width Er 63.It Bq Er EPERM 64The current process is not the super-user and a change 65other than changing the effective user-id to the real user-id 66was specified. 67.El 68.Sh SEE ALSO 69.Xr getuid 2 , 70.Xr setregid 2 , 71.Xr setuid 3 72.Sh HISTORY 73The 74.Fn setreuid 75function call appeared in 76.Bx 4.2 . 77