1994-05-27 05:00:24 +00:00
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" @(#)setreuid.2 8.2 (Berkeley) 4/16/94
|
1999-08-28 00:22:10 +00:00
|
|
|
.\" $FreeBSD$
|
1994-05-27 05:00:24 +00:00
|
|
|
.\"
|
2001-02-09 12:47:23 +00:00
|
|
|
.Dd February 8, 2001
|
1994-05-27 05:00:24 +00:00
|
|
|
.Dt SETREUID 2
|
2001-07-10 13:41:46 +00:00
|
|
|
.Os
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm setreuid
|
|
|
|
|
.Nd set real and effective user ID's
|
2000-04-21 09:42:15 +00:00
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libc
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh SYNOPSIS
|
2001-10-01 16:09:29 +00:00
|
|
|
.In unistd.h
|
1994-05-27 05:00:24 +00:00
|
|
|
.Ft int
|
|
|
|
|
.Fn setreuid "uid_t ruid" "uid_t euid"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The real and effective user IDs of the
|
|
|
|
|
current process are set according to the arguments.
|
|
|
|
|
If
|
|
|
|
|
.Fa ruid
|
2001-07-15 07:53:42 +00:00
|
|
|
or
|
1994-05-27 05:00:24 +00:00
|
|
|
.Fa euid
|
|
|
|
|
is -1, the current uid is filled in by the system.
|
|
|
|
|
Unprivileged users may change the real user
|
|
|
|
|
ID to the effective user ID and vice-versa; only the super-user may
|
|
|
|
|
make other changes.
|
|
|
|
|
.Pp
|
2001-02-09 12:47:23 +00:00
|
|
|
If the real user ID is changed (i.e.\&
|
2001-02-08 12:43:33 +00:00
|
|
|
.Fa ruid
|
|
|
|
|
is not -1) or the effective user ID is changed to something other than
|
|
|
|
|
the real user ID, then the saved user ID will be set to the effective user ID.
|
|
|
|
|
.Pp
|
1994-05-27 05:00:24 +00:00
|
|
|
The
|
|
|
|
|
.Fn setreuid
|
|
|
|
|
function has been used to swap the real and effective user IDs
|
|
|
|
|
in set-user-ID programs to temporarily relinquish the set-user-ID value.
|
|
|
|
|
This purpose is now better served by the use of the
|
|
|
|
|
.Fn seteuid
|
|
|
|
|
function (see
|
|
|
|
|
.Xr setuid 2 ) .
|
|
|
|
|
.Pp
|
|
|
|
|
When setting the real and effective user IDs to the same value,
|
|
|
|
|
the standard
|
|
|
|
|
.Fn setuid
|
|
|
|
|
function is preferred.
|
|
|
|
|
.Sh RETURN VALUES
|
2001-07-15 07:53:42 +00:00
|
|
|
.Rv -std setreuid
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh ERRORS
|
2000-05-04 13:09:25 +00:00
|
|
|
.Bl -tag -width Er
|
1994-05-27 05:00:24 +00:00
|
|
|
.It Bq Er EPERM
|
|
|
|
|
The current process is not the super-user and a change
|
|
|
|
|
other than changing the effective user-id to the real user-id
|
|
|
|
|
was specified.
|
|
|
|
|
.El
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr getuid 2 ,
|
1997-04-01 18:58:38 +00:00
|
|
|
.Xr issetugid 2 ,
|
1994-05-27 05:00:24 +00:00
|
|
|
.Xr seteuid 2 ,
|
|
|
|
|
.Xr setuid 2
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
1996-08-22 23:31:07 +00:00
|
|
|
.Fn setreuid
|
1995-04-23 12:31:13 +00:00
|
|
|
system call appeared in
|
|
|
|
|
.Bx 4.2 .
|
