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-.\" Copyright (c) 1983, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)setuid.2	8.1 (Berkeley) 6/4/93
-.\"	$Id: setuid.2,v 1.10 1997/04/01 18:58:38 mpp Exp $
-.\"
-.Dd June 4, 1993
-.Dt SETUID 2
-.Os BSD 4.2
-.Sh NAME
-.Nm setuid ,
-.Nm seteuid ,
-.Nm setgid ,
-.Nm setegid ,
-.Nd set user and group ID
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <unistd.h>
-.Ft int
-.Fn setuid "uid_t uid"
-.Ft int
-.Fn seteuid "uid_t euid"
-.Ft int
-.Fn setgid "gid_t gid"
-.Ft int
-.Fn setegid "gid_t egid"
-.Sh DESCRIPTION
-The
-.Fn setuid
-function
-sets the real and effective
-user IDs and the saved set-user-ID of the current process
-to the specified value.
-.\" Comment out next block for !_POSIX_SAVED_IDS
-.\" The real user ID and the saved set-user-ID are changed only if the
-.\" effective user ID is that of the super user.
-.\" I.e.
-.\" .Fn setuid
-.\" function is equal to
-.\" .Fn seteuid
-.\" function if the effective user ID is not that of the super user.
-.\" End of block
-The
-.Fn setuid
-function is permitted if the specified ID is equal to the real user ID
-.\" Comment out next line for !_POSIX_SAVED_IDS
-.\" or the saved set-user-ID
-.\" Next line is for Appendix B.4.2.2 case.
-or the effective user ID
-of the process, or if the effective user ID is that of the super user.
-.Pp
-The
-.Fn setgid
-function
-sets the real and effective
-group IDs and the saved set-group-ID of the current process
-to the specified value.
-.\" Comment out next block for !_POSIX_SAVED_IDS
-.\" The real group ID and the saved set-group-ID are changed only if the
-.\" effective user ID is that of the super user.
-.\" I.e.
-.\" .Fn setgid
-.\" function is equal to
-.\" .Fn setegid
-.\" function if the effective user ID is not that of the super user.
-.\" End of block
-The
-.Fn setgid
-function is permitted if the specified ID is equal to the real group ID
-.\" Comment out next line for !_POSIX_SAVED_IDS
-.\" or the saved set-groupd-ID
-.\" Next line is for Appendix B.4.2.2 case.
-or the effective group ID
-of the process, or if the effective user ID is that of the super user.
-.Pp
-The
-.Fn seteuid
-function
-.Pq Fn setegid
-sets the effective user ID (group ID) of the
-current process.
-The effective user ID may be set to the value
-of the real user ID or the saved set-user-ID (see
-.Xr intro 2
-and
-.Xr execve 2 ) ;
-in this way, the effective user ID of a set-user-ID executable
-may be toggled by switching to the real user ID, then re-enabled
-by reverting to the set-user-ID value.
-Similarly, the effective group ID may be set to the value
-of the real group ID or the saved set-user-ID.
-.Pp
-.Sh RETURN VALUES
-Upon success, these functions return 0;
-otherwise \-1 is returned.
-.Pp
-If the user is not the super user, or the uid
-specified is not the real, effective ID, or saved ID,
-these functions return \-1.
-.Sh SEE ALSO
-.Xr getgid 2 ,
-.Xr getuid 2 ,
-.Xr issetugid 2 ,
-.Xr setregid 2 ,
-.Xr setreuid 2
-.Sh STANDARDS
-The
-.Fn setuid
-and
-.Fn setgid
-functions are compliant with the
-.St -p1003.1-90
-specification with
-.Li _POSIX_SAVED_IDS
-.\" Uncomment next line for !_POSIX_SAVED_IDS
-not
-defined with the permitted extensions from Appendix B.4.2.2.
-The
-.Fn seteuid
-and
-.Fn setegid
-functions are extensions based on the 
-.Tn POSIX
-concept of
-.Li _POSIX_SAVED_IDS ,
-and have been proposed for a future revision of the standard.
-.Sh HISTORY
-A
-.Fn setuid
-and a
-.Fn setgid
-function calls appeared in
-.At v7 .