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89 lines
3.2 KiB
Groff
89 lines
3.2 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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.\"
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.TH SETREUID 2 "16 January 1996" GNO "System Calls"
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.SH NAME
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.BR setreuid
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\- set real and effective user ID
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.SH SYNOPSIS
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.br
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#include <unistd.h>
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.sp 1
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int
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\fBsetreuid\fR (uid_t \fIruid\fR, uid_t \fIeuid\fR);
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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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.I ruid
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or
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.I 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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.LP
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The
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.BR 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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.BR seteuid
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function (see
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.BR setuid (2)).
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.LP
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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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.BR setuid
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function is preferred.
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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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.IR errno
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is set to indicate the error.
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.SH ERRORS
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.RS
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.IP \fBEPERM\fR
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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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.RE
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.SH SEE ALSO
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.BR getuid (2),
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.BR seteuid (2),
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.BR setuid (2)
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.SH HISTORY
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The
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.BR setreuid
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system call appeared in 4.2BSD.
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