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+.\" Copyright (c) 1983, 1991 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.
+.\"
+.\"     from: @(#)setuid.3	6.4 (Berkeley) 4/19/91
+.\"	$Id: setruid.3,v 1.1 1995/10/18 08:41:46 deraadt Exp $
+.\"
+.Dd April 19, 1991
+.Dt SETRUID 3
+.Os BSD 4.2
+.Sh NAME
+.Nm setruid ,
+.Nm setrgid
+.Nd set user and group ID
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Ft int
+.Fn setruid "uid_t uid"
+.Ft int
+.Fn setrgid "gid_t gid"
+.Sh DESCRIPTION
+The
+.Fn setruid
+function
+.Pq Fn setrgid
+sets the real user ID (group ID)
+of the current process to the specified value.
+.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 (gid) specified is not
+the real or effective ID of the process,
+these functions return \-1.
+.Sh SEE ALSO
+.Xr setuid 2 ,
+.Xr setgid 2 ,
+.Xr seteuid 2 ,
+.Xr setegid 2 ,
+.Xr getuid 2 ,
+.Xr getgid 2
+.Sh HISTORY
+The
+.Fn setruid
+and
+.Fn setrgid
+syscalls appeared in
+.Bx 4.2
+and were dropped in
+.Bx 4.4 .