93 lines
3.3 KiB
Groff
93 lines
3.3 KiB
Groff
.\" 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
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" 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 issetugid 2 ,
|
|
.Xr setegid 2 ,
|
|
.Xr setgid 2 ,
|
|
.Xr setuid 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn setregid
|
|
system call appeared in
|
|
.Bx 4.2 .
|