1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)rexec.3 8.1 (Berkeley) 6/4/93 29.\" $NetBSD: rexec.3,v 1.13 2003/08/07 16:44:16 agc Exp $ 30.\" 31.Dd June 4, 1993 32.Dt REXEC 3 33.Os 34.Sh NAME 35.Nm rexec 36.Nd return stream to a remote command 37.Sh LIBRARY 38.Lb libcompat 39.Sh SYNOPSIS 40.Ft int 41.Fn rexec "char **ahost" "int inport" "char *user" "char *passwd" "char *cmd" "int *fd2p" 42.Sh DESCRIPTION 43.Bf -symbolic 44This interface is obsoleted by 45.Xr rcmd 3 . 46It is available from the compatibility library, libcompat. 47.Ef 48.Pp 49The 50.Fn rexec 51function looks up the host 52.Fa *ahost 53using 54.Xr gethostbyname 3 , 55returning \-1 if the host does not exist. 56Otherwise 57.Fa *ahost 58is set to the standard name of the host. 59If a username and password are both specified, then these 60are used to authenticate to the foreign host; otherwise 61the environment and then the user's 62.Pa .netrc 63file in his home directory are searched for appropriate information. 64If all this fails, the user is prompted for the information. 65.Pp 66The port 67.Fa inport 68specifies which well-known 69.Tn DARPA 70Internet port to use for the connection; the call 71.Ql getservbyname(\\*qexec\\*q, \\*qtcp\\*q) 72(see 73.Xr getservent 3 ) 74will return a pointer to a structure, which contains the 75necessary port. 76The protocol for connection is described in detail in 77.Xr rexecd 8 . 78.Pp 79If the connection succeeds, a socket in the Internet domain of type 80.Dv SOCK_STREAM 81is returned to the caller, and given to the remote command as 82.Em stdin 83and 84.Em stdout . 85If 86.Fa fd2p 87is non-zero, then an auxiliary channel to a control 88process will be set up, and a descriptor for it will be placed 89in 90.Fa *fd2p . 91The control process will return diagnostic 92output from the command (unit 2) on this channel, and will also 93accept bytes on this channel as being 94.Ux 95signal numbers, to be forwarded to the process group of the command. 96The diagnostic information returned does not include remote authorization 97failure, as the secondary connection is set up after authorization has been 98verified. 99If 100.Fa fd2p 101is 0, then the 102.Em stderr 103(unit 2 of the remote command) will be made the same as the 104.Em stdout 105and no 106provision is made for sending arbitrary signals to the remote process, 107although you may be able to get its attention by using out-of-band data. 108.Sh SEE ALSO 109.Xr rcmd 3 , 110.Xr rexecd 8 111.Sh HISTORY 112The 113.Fn rexec 114function appeared in 115.Bx 4.2 . 116