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+.\"	$OpenBSD: rcmdsh.3,v 1.6 1999/07/05 04:41:00 aaron 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. 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.
+.\"
+.\" $FreeBSD: src/lib/libc/net/rcmdsh.3,v 1.2 2001/11/09 15:19:25 ru Exp $
+.\"
+.Dd September 1, 1996
+.Dt RCMDSH 3
+.Os
+.Sh NAME
+.Nm rcmdsh
+.Nd return a stream to a remote command without superuser
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fo rcmdsh
+.Fa "char **ahost"
+.Fa "int inport"
+.Fa "const char *locuser"
+.Fa "const char *remuser"
+.Fa "const char *cmd"
+.Fa "const char *rshprog"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn rcmdsh
+function
+is used by normal users to execute a command on
+a remote machine using an authentication scheme based
+on reserved port numbers using
+.Xr rshd 8
+or the value of
+.Fa rshprog
+(if
+.No non- Ns Dv NULL ) .
+.Pp
+The
+.Fn rcmdsh
+function
+looks up the host
+.Fa *ahost
+using
+.Xr gethostbyname 3 ,
+returning \-1 if the host does not exist.
+Otherwise
+.Fa *ahost
+is set to the standard name of the host
+and a connection is established to a server
+residing at the well-known Internet port
+.Dq Li shell/tcp
+(or whatever port is used by
+.Fa rshprog ) .
+The parameter
+.Fa inport
+is ignored; it is only included to provide an interface similar to
+.Xr rcmd 3 .
+.Pp
+If the connection succeeds,
+a socket in the
+.Ux
+domain of type
+.Dv SOCK_STREAM
+is returned to the caller, and given to the remote
+command as stdin, stdout, and stderr.
+.Sh RETURN VALUES
+The
+.Fn rcmdsh
+function
+returns a valid socket descriptor on success.
+Otherwise, \-1 is returned
+and a diagnostic message is printed on the standard error.
+.Sh SEE ALSO
+.Xr rsh 1 ,
+.Xr socketpair 2 ,
+.Xr rcmd 3 ,
+.Xr rshd 8
+.Sh BUGS
+If
+.Xr rsh 1
+encounters an error, a file descriptor is still returned instead of \-1.
+.Sh HISTORY
+The
+.Fn rcmdsh
+function first appeared in
+.Ox 2.0 ,
+and made its way into
+.Fx 5.0 .