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+.\"	$NetBSD: setuid.2,v 1.23 2019/09/02 00:05:38 sevan Exp $
+.\"
+.\" 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. 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
+.\"
+.Dd September 2, 2019
+.Dt SETUID 2
+.Os
+.Sh NAME
+.Nm setuid ,
+.Nm seteuid ,
+.Nm setgid ,
+.Nm setegid
+.Nd set user and group ID
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In 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.
+The
+.Fn setuid
+function is permitted if the specified ID is equal to the real 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.
+The
+.Fn setgid
+function is permitted if the specified ID is equal to the real group ID
+of the process, or if the effective user ID is that of the super user.
+Supplementary group IDs remain unchanged.
+.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-group-ID.
+.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 getgroups 2 ,
+.Xr getuid 2
+.Sh STANDARDS
+The
+.Fn setuid
+and
+.Fn setgid
+functions are compliant with the
+.St -p1003.1-90
+specification with
+.Li _POSIX_SAVED_IDS
+not defined.
+We do not implement the
+.Li _POSIX_SAVED_IDS
+option as specified in the standard
+because this would make it impossible for a set-user-ID executable owned
+by a user other than the super-user to permanently revoke its privileges.
+.Pp
+The
+.Fn seteuid
+and
+.Fn setegid
+functions are compliant with
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn setuid
+and
+.Fn setgid
+functions appeared in
+.At v1
+and
+.At v4 ,
+respectively.