104 lines
3.7 KiB
Groff
104 lines
3.7 KiB
Groff
.\" $OpenBSD: setregid.2,v 1.11 2015/02/05 02:33:09 schwarze Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993, 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)setregid.2 8.2 (Berkeley) 4/16/94
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.\"
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.Dd $Mdocdate: February 5 2015 $
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.Dt SETREGID 2
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.Os
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.Sh NAME
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.Nm setregid
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.Nd set real and effective group IDs
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn setregid "gid_t rgid" "gid_t egid"
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.Sh DESCRIPTION
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The real and effective group IDs of the current process
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are set according to the arguments.
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The saved group ID will be set to the new value of the real group
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ID if a real group ID is specified and either
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the new real group ID value is different from the current value
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or the new value of the effective group ID differs from the
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current saved group ID.
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.Pp
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Unprivileged users may change either group ID to the current value
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of the real, effective, or saved group ID.
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Only the superuser may make other changes.
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.Pp
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Supplying a value of -1 for either the real or effective
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group ID forces the system to substitute the current
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ID in place of the -1 parameter.
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.Pp
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The
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.Fn setregid
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function was intended to allow swapping the real and
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effective group IDs in set-group-ID programs to temporarily relinquish
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the set-group-ID value.
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This purpose is now better served by the use of the
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.Xr setegid 2
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function.
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.Pp
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When setting the real and effective group IDs to the same value, the
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.Xr setgid 2
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function is preferred.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EPERM
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The current process is not the superuser and a change
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other than changing the effective group ID to the real group ID
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was specified.
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.El
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.Sh SEE ALSO
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.Xr getgid 2 ,
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.Xr setegid 2 ,
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.Xr setgid 2 ,
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.Xr setresgid 2 ,
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.Xr setreuid 2
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.Sh STANDARDS
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The
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.Fn setregid
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function conforms to the
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.St -p1003.1-2008
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specification, except that the conditions for changing the saved
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group ID differ and that, if it is changed, the saved group ID
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is set to the real group ID instead of the effective group ID.
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.Sh HISTORY
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The
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.Fn setregid
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system call first appeared in
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.Bx 4.1c ,
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predating POSIX.
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A semantically different version appeared in
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.Bx 4.4 .
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The current version, with the original semantics restored, appeared in
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.Ox 3.3 .
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