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+.\"	$OpenBSD: setuid.2,v 1.23 2014/09/09 08:16:12 jmc Exp $
+.\"	$NetBSD: setuid.2,v 1.3 1995/02/27 12:37:06 cgd 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 $Mdocdate: September 9 2014 $
+.Dt SETUID 2
+.Os
+.Sh NAME
+.Nm setuid ,
+.Nm seteuid ,
+.Nm setgid ,
+.Nm setegid
+.Nd set user and group ID
+.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 effective user ID is that of the superuser,
+or if the specified user ID is the same as the effective user ID.
+If not, but the specified user ID is the same as the real user ID,
+.Fn setuid
+will set the effective user ID to the real user ID.
+.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 effective user ID is that of the superuser,
+or if the specified group ID is the same as the effective group ID.
+If not, but the specified group ID is the same as the real group ID,
+.Fn setgid
+will set the effective group ID to the real group ID.
+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
+.Rv -std setuid seteuid setgid setegid
+.Sh ERRORS
+.Fn setuid
+and
+.Fn seteuid
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The user is not the superuser and the requested
+.Fa uid
+or
+.Fa euid
+is not the process's real, effective, or saved UID.
+.El
+.Pp
+.Fn setgid
+and
+.Fn setegid
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The user is not the superuser and the requested
+.Fa gid
+or
+.Fa egid
+is not the process's real, effective, or saved GID.
+.El
+.Sh SEE ALSO
+.Xr getgid 2 ,
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr setgroups 2 ,
+.Xr setregid 2 ,
+.Xr setresgid 2 ,
+.Xr setresuid 2 ,
+.Xr setreuid 2
+.Sh STANDARDS
+The
+.Fn setuid ,
+.Fn seteuid ,
+.Fn setgid ,
+and
+.Fn setegid
+functions conform to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn setuid
+system call first appeared in
+.At v1 ;
+.Fn setgid
+in
+.At v4 ;
+and
+.Fn seteuid
+and
+.Fn setegid
+in
+.Bx 4.2 .