mirror of https://github.com/mkerrisk/man-pages
119 lines
4.5 KiB
Groff
119 lines
4.5 KiB
Groff
.\" Copyright (c) 1983, 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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.\" @(#)setregid.2 6.4 (Berkeley) 3/10/91
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.\"
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.\" Modified Sat Jul 24 09:08:49 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Portions extracted from linux/kernel/sys.c:
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.\" Copyright (C) 1991, 1992 Linus Torvalds
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.\" May be distributed under the GNU General Public License
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.\" Changes: 1994-07-29 by Wilf <G.Wilford@ee.surrey.ac.uk>
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.\" 1994-08-02 by Wilf due to change in kernel.
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.\" 2004-07-04 by aeb
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.\" 2004-05-27 by Michael Kerrisk
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.\"
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.TH SETREUID 2 2004-07-04 "Linux 2.6" "Linux Programmer's Manual"
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.SH NAME
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setreuid, setregid \- set real and/or effective user or group ID
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.SH SYNOPSIS
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.B #include <sys/types.h>
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.br
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.B #include <unistd.h>
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.sp
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.BI "int setreuid(uid_t " ruid ", uid_t " euid );
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.br
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.BI "int setregid(gid_t " rgid ", gid_t " egid );
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.SH DESCRIPTION
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.BR setreuid ()
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sets real and effective user IDs of the current process.
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Supplying a value of \-1 for either the real or effective user ID forces
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the system to leave that ID unchanged.
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Unprivileged processes may only set the effective user ID to the real user ID,
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the effective user ID or the saved set-user-ID.
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POSIX: It is unspecified whether unprivileged processes may set the
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real user ID to the real user ID, the effective user ID or the
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saved set-user-ID.
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Linux: Unprivileged users may only set the real user ID to
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the real user ID or the effective user ID.
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Linux: If the real user ID is set or the effective user ID is set to a value
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not equal to the previous real user ID,
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the saved set-user-ID will be set to the new effective user ID.
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Completely analogously,
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.BR setregid ()
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sets real and effective group ID's of the current process,
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and all of the above holds with "group" instead of "user".
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.SH "RETURN VALUE"
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On success, zero is returned. On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EPERM
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The current process is not privileged
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(Linux: does not have the
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.B CAP_SETUID
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capability in the case of
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.BR setreuid (),
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or the
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.B CAP_SETGID
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capability in the case of
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.BR setregid ())
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and a change other than (i)
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swapping the effective user (group) ID with the real user (group) ID,
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or (ii) setting one to the value of the other or (iii) setting the
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effective user (group) ID to the value of the
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saved set-user-ID (saved set-group-ID) was specified.
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.SH NOTES
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Setting the effective user (group) ID to the
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saved set-user-ID (saved set-group-ID) is
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possible since Linux 1.1.37 (1.1.38).
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.SH "CONFORMING TO"
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4.3BSD (the
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.BR setreuid ()
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and
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.BR setregid ()
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function calls first appeared in 4.2BSD).
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.SH "SEE ALSO"
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.BR getgid (2),
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.BR getuid (2),
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.BR seteuid (2),
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.BR setgid (2),
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.BR setresuid (2),
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.BR setuid (2),
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.BR capabilities (7)
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