1 files changed, 121 insertions, 0 deletions
diff --git a/lib/libc/sys/setuid.2 b/lib/libc/sys/setuid.2
new file mode 100644
index 000000000000..eb596cc4918f
--- /dev/null
+++ b/lib/libc/sys/setuid.2
@@ -0,0 +1,121 @@
+.\" 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: setuid.2,v 1.2 1994/04/21 21:30:20 wollman Exp $
+.\"
+.Dd March 16, 1994
+.Dt SETUID 2
+.Os
+.Sh NAME
+.Nm setuid ,
+.Nm seteuid ,
+.\" .Nm setruid ,
+.Nm setgid ,
+.Nm setegid ,
+.\" .Nm setrgid
+.Nd set user and group ID
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Ft int
+.Fn setuid "uid_t uid"
+.Ft int
+.Fn seteuid "uid_t euid"
+.\" .Ft int
+.\" .Fn setruid "uid_t ruid"
+.Ft int
+.Fn setgid "gid_t gid"
+.Ft int
+.Fn setegid "gid_t egid"
+.\" .Ft int
+.\" .Fn setrgid "gid_t rgid"
+.Sh DESCRIPTION
+The
+.Fn setuid
+function
+.Pq Fn setgid
+sets the real, effective, and saved
+user IDs (group IDs) of the current process
+as specified.
+.Pp
+The
+.Fn seteuid
+function
+.Pq Fn setegid
+sets the effective user ID (group ID) of the
+current process.
+.\".Pp
+.\" The
+.\" .Fn setruid
+.\" function
+.\" .Pq Fn setrgid
+.\" sets the real user ID (group ID) of the
+.\" current process.
+.Pp
+When any of these calls succeed, the
+.Dv SUGID
+process flag is turned on, and remains on until the process calls
+.Xr execve 2 ;
+this flag can be inspected with
+.Xr ps 1 .
+.Sh RETURN VALUES
+Upon success, these functions return 0;
+otherwise \-1 is returned.
+.Pp
+If the user is not the super user, and the ID specified is not the
+current real ID, the
+.Nm setuid
+and
+.Nm setgid
+functions return \-1.
+.Pp
+If the user is not the super user, and the ID specfied is not the
+current real ID, the
+.\" nor the saved ID, the
+.\" should this really be true that setuid(geteuid()) is not allowed?
+.Nm seteuid
+and
+.Nm setegid
+functions return \-1.
+.Sh SEE ALSO
+.Xr setreuid 2 ,
+.Xr setregid 2 ,
+.Xr getuid 2 ,
+.Xr getgid 2 ,
+.Xr execve 2 ,
+.Xr ps 1
+.Sh HISTORY
+A
+.Fn setuid
+and
+.Fn setgid
+syscall appeared in 
+.At v6 .