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96 lines
3.3 KiB
Groff
96 lines
3.3 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 BSD 4
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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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.Fd #include <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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function 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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.Fn seteuid
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function (see
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.Xr setuid 2 ) .
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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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function 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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