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-.\" Copyright (c) 1980, 1991, 1993, 1994
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" 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 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
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)setregid.2	8.2 (Berkeley) 4/16/94
-.\"
-.Dd April 16, 1994
-.Dt SETREGID 2
-.Os BSD 4.2
-.Sh NAME
-.Nm setregid
-.Nd set real and effective group ID
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.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 to the arguments.
-Unprivileged users may change the real group
-ID to the effective group ID and vice-versa; only the super-user may
-make other changes.
-.Pp
-Supplying a value of -1 for either the real or effective
-group ID forces the system to substitute the current
-ID in place of the -1 parameter.
-.Pp
-The
-.Fn setregid
-function was intended to allow swapping
-the real and effective group IDs
-in set-group-ID programs to temporarily relinquish the set-group-ID value.
-This function did not work correctly,
-and its 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,
-the standard
-.Fn setgid
-function is preferred.
-.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 [EPERM]
-.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
-.Nm
-function call appeared in
-.Bx 4.2
-and was dropped in
-.Bx 4.4 .