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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)rexec.3 8.1 (Berkeley) 6/4/93 33.\" 34.Dd June 4, 1993 35.Dt REXEC 3 36.Os BSD 4.2 37.Sh NAME 38.Nm rexec 39.Nd return stream to a remote command 40.Sh SYNOPSIS 41.Ft int 42.Fn rexec ahost "int inport" "char *user" "char *passwd" "char *cmd" "int *fd2p" 43.Sh DESCRIPTION 44.Bf -symbolic 45This interface is obsoleted by 46.Xr krcmd 3 . 47It is available from the compatibility library, libcompat. 48.Ef 49.Pp 50The 51.Fn rexec 52function 53looks up the host 54.Fa *ahost 55using 56.Xr gethostbyname 3 , 57returning \-1 if the host does not exist. 58Otherwise 59.Fa *ahost 60is set to the standard name of the host. 61If a username and password are both specified, then these 62are used to authenticate to the foreign host; otherwise 63the environment and then the user's 64.Pa .netrc 65file in his 66home directory are searched for appropriate information. 67If all this fails, the user is prompted for the information. 68.Pp 69The port 70.Fa inport 71specifies which well-known 72.Tn DARPA 73Internet port to use for 74the connection; the call 75.Ql getservbyname(\\*qexec\\*q, \\*qtcp\\*q) 76(see 77.Xr getservent 3 ) 78will return a pointer to a structure, which contains the 79necessary port. 80The protocol for connection is described in detail in 81.Xr rexecd 8 . 82.Pp 83If the connection succeeds, 84a socket in the Internet domain of type 85.Dv SOCK_STREAM 86is returned to 87the caller, and given to the remote command as 88.Em stdin 89and 90.Em stdout . 91If 92.Fa fd2p 93is non-zero, then an auxiliary channel to a control 94process will be setup, and a descriptor for it will be placed 95in 96.Fa *fd2p . 97The control process will return diagnostic 98output from the command (unit 2) on this channel, and will also 99accept bytes on this channel as being 100.Tn UNIX 101signal numbers, to be 102forwarded to the process group of the command. The diagnostic 103information returned does not include remote authorization failure, 104as the secondary connection is set up after authorization has been 105verified. 106If 107.Fa fd2p 108is 0, then the 109.Em stderr 110(unit 2 of the remote 111command) will be made the same as the 112.Em stdout 113and no 114provision is made for sending arbitrary signals to the remote process, 115although you may be able to get its attention by using out-of-band data. 116.Sh SEE ALSO 117.Xr rcmd 3 , 118.Xr rexecd 8 119.Sh HISTORY 120The 121.Fn rexec 122function appeared in 123.Bx 4.2 . 124