1.\" Copyright (c) 1983, 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: @(#)setregid.2 6.4 (Berkeley) 3/10/91 33.\" $Id: setregid.2,v 1.4 1993/11/29 21:25:35 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SETREGID 2 37.Os BSD 4.2 38.Sh NAME 39.Nm setregid 40.Nd set real and effective group ID 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft int 44.Fn setregid "int rgid" "int egid" 45.Sh DESCRIPTION 46The real and effective group ID's of the current process 47are set to the arguments. 48Unprivileged users may change the real group 49ID to the effective group ID and vice-versa; only the super-user may 50make other changes. 51.Pp 52Supplying a value of -1 for either the real or effective 53group ID forces the system to substitute the current 54ID in place of the -1 parameter. 55.Sh RETURN VALUES 56Upon successful completion, a value of 0 is returned. Otherwise, 57a value of -1 is returned and 58.Va errno 59is set to indicate the error. 60.Sh ERRORS 61.Bl -tag -width Er 62.It Bq Er EPERM 63The current process is not the super-user and a change 64other than changing the effective group-id to the real group-id 65was specified. 66.El 67.Sh SEE ALSO 68.Xr getgid 2 , 69.Xr setreuid 2 , 70.Xr setgid 3 71.Sh HISTORY 72The 73.Fn setregid 74function call appeared in 75.Bx 4.2 . 76