fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
91 lines
3.0 KiB
Groff
91 lines
3.0 KiB
Groff
.\" 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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.\" @(#)setreuid.2 8.2 (Berkeley) 4/16/94
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.\" $FreeBSD$
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.\"
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.Dd February 8, 2001
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.Dt SETREUID 2
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.Os
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.Sh NAME
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.Nm setreuid
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.Nd set real and effective user ID's
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn setreuid "uid_t ruid" "uid_t euid"
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.Sh DESCRIPTION
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The real and effective user IDs of the
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current process are set according to the arguments.
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If
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.Fa ruid
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or
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.Fa euid
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is -1, the current uid is filled in by the system.
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Unprivileged users may change the real user
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ID to the effective user ID and vice-versa; only the super-user may
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make other changes.
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.Pp
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If the real user ID is changed (i.e.\&
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.Fa ruid
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is not -1) or the effective user ID is changed to something other than
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the real user ID, then the saved user ID will be set to the effective user ID.
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.Pp
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The
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.Fn setreuid
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system call has been used to swap the real and effective user IDs
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in set-user-ID programs to temporarily relinquish the set-user-ID value.
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This purpose is now better served by the use of the
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.Xr seteuid 2
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system call.
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.Pp
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When setting the real and effective user IDs to the same value,
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the standard
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.Fn setuid
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system call is preferred.
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.Sh RETURN VALUES
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.Rv -std setreuid
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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 super-user and a change
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other than changing the effective user-id to the real user-id
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was specified.
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.El
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.Sh SEE ALSO
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.Xr getuid 2 ,
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.Xr issetugid 2 ,
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.Xr seteuid 2 ,
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.Xr setuid 2
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.Sh HISTORY
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The
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.Fn setreuid
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system call appeared in
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.Bx 4.2 .
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