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121 lines
3.9 KiB
Groff
121 lines
3.9 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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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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.\" @(#)setuid.2 8.1 (Berkeley) 6/4/93
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.\"
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.TH SETUID 2 "16 January 1996" GNO "System Calls"
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.SH NAME
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.BR setuid ,
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.BR seteuid ,
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.BR setgid ,
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.BR setegid ,
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\- set user and group ID
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.SH SYNOPSIS
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#include <sys/types.h>
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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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\fBsetuid\fR (uid_t \fIuid\fR);
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.br
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int
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\fBseteuid\fR (uid_t \fIeuid\fR);
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.br
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int
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\fBsetgid\fR (gid_t \fIgid\fR);
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.br
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int
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\fBsetegid\fR (gid_t \fIegid\fR);
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.SH DESCRIPTION
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The
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.BR setuid
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function
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sets the real and effective
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user IDs and the saved set-user-ID of the current process
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to the specified value.
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The
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.BR setuid
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function is permitted if the specified ID is equal to the real user ID
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of the process, or if the effective user ID is that of the super user.
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.LP
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The
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.BR setgid
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function
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sets the real and effective
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group IDs and the saved set-group-ID of the current process
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to the specified value.
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The
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.BR setgid
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function is permitted if the specified ID is equal to the real group ID
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of the process, or if the effective user ID is that of the super user.
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.LP
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The
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.BR seteuid
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function
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sets the effective user ID (group ID) of the
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current process.
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The effective user ID may be set to the value
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of the real user ID or the saved set-user-ID (see
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.BR intro (2)
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and
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.BR execve (2));
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in this way, the effective user ID of a set-user-ID executable
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may be toggled by switching to the real user ID, then re-enabled
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by reverting to the set-user-ID value.
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Similarly, the effective group ID may be set to the value
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of the real group ID or the saved set-user-ID.
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.LP
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.SH RETURN VALUES
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Upon success, these functions return 0;
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otherwise \-1 is returned.
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.LP
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If the user is not the super user, or the uid
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specified is not the real, effective ID, or saved ID,
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these functions return \-1.
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.SH SEE ALSO
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.BR getuid (2),
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.BR getgid (2)
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.SH STANDARDS
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The
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.BR setuid
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and
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.BR setgid
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functions are compliant with the
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POSIX 1003.1-88
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specification with _POSIX_SAVED_IDS not defined.
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The
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.BR seteuid
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and
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.BR setegid
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functions are extensions based on the POSIX
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concept of _POSIX_SAVED_IDS,
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and have been proposed for a future revision of the standard.
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