143 lines
5.6 KiB
Groff
143 lines
5.6 KiB
Groff
.\" $NetBSD: setreuid.2,v 1.9 1998/08/15 09:16:27 mycroft Exp $
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.\"
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Charles M. Hannum.
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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 NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\"
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.\" Copyright (c) 1980, 1991 The Regents of the University of California.
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.\" 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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.\" from: @(#)setreuid.2 6.4 (Berkeley) 3/10/91
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.\"
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.Dd June 23, 1996
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.Dt SETREUID 2
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.Os BSD 4.2
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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 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 ID's of the
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current process are set according to the arguments. If the real user ID
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is changed, the saved user ID is changed to the new value of the effective
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user ID.
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.Pp
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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 may change the effective user ID to the
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real user ID or the saved user ID; only the super-user may
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make other changes.
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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
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IDs in set-user-ID programs to temporarily relinquish the set-user-ID
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value. 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, this
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function is equivalent to the
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.Fn setuid
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function.
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When setting only the effective user ID, this function is equivalent to
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the
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.Fn seteuid
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function.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned. Otherwise,
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a value of -1 is returned and
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.Va errno
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is set to indicate the error.
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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 seteuid 2 ,
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.Xr setuid 2 ,
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.Xr setgid 2
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.Sh HISTORY
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The
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.Fn setreuid
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function call appeared in
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.Bx 4.2
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and was dropped in
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.Bx 4.4 .
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It was reimplemented in
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.Nx 1.2
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in a way compatible with
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.Bx 4.3 ,
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SunOS and Linux.
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