.\" $NetBSD: setregid.2,v 1.11 1999/12/02 21:42:39 kleink Exp $ .\" .\" Copyright (c) 1998 The NetBSD Foundation, Inc. .\" All rights reserved. .\" .\" This code is derived from software contributed to The NetBSD Foundation .\" by Charles M. Hannum. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the NetBSD .\" Foundation, Inc. and its contributors. .\" 4. 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Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" from: @(#)setregid.2 6.4 (Berkeley) 3/10/91 .\" .Dd June 23, 1996 .Dt SETREGID 2 .Os .Sh NAME .Nm setregid .Nd set real and effective group ID's .Sh LIBRARY .Lb libc .Sh SYNOPSIS .Fd #include .Ft int .Fn setregid "gid_t rgid" "gid_t egid" .Sh DESCRIPTION The real and effective group ID's of the current process are set according to the arguments. If the real group ID is changed, the saved group ID is changed to the new value of the effective group ID. .Pp If .Fa rgid or .Fa egid is -1, the current gid is filled in by the system. Unprivileged users may change the real group ID to the effective group ID, and may change the effective group ID to the real group ID or the saved group ID; only the super-user may make other changes. .Pp The .Fn setregid function has been used to swap the real and effective group IDs in set-group-ID programs to temporarily relinquish the set-group-ID value. This purpose is now better served by the use of the .Fn setegid function (see .Xr setuid 2 ). .Pp When setting the real and effective group IDs to the same value, this function is equivalent to the .Fn setgid function. When setting only the effective group ID, this function is equivalent to the .Fn setegid function. .Sh RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and .Va errno is set to indicate the error. .Sh ERRORS .Bl -tag -width Er .It Bq Er EPERM The current process is not the super-user and a change other than changing the effective group-id to the real group-id was specified. .El .Sh SEE ALSO .Xr getgid 2 , .Xr setegid 2 , .Xr setgid 2 , .Xr setuid 2 .Sh HISTORY The .Fn setregid function call appeared in .Bx 4.2 and was dropped in .Bx 4.4 . It was reimplemented in .Nx 1.2 in a way compatible with .Bx 4.3 , SunOS and Linux.