1 .\" Copyright (c) 1992, 1993 Eugene W. Stark
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
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 Eugene W. Stark.
15 .\" 4. The name of the author may not be used to endorse or promote products
16 .\" derived from this software without specific prior written permission.
18 .\" THIS SOFTWARE IS PROVIDED BY EUGENE W. STARK (THE AUTHOR) ``AS IS'' AND
19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 .\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 .\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 .\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 .\" $FreeBSD: src/libexec/xtend/xtend.8,v 1.11.2.4 2001/08/16 10:44:22 ru Exp $
39 .Nm /usr/libexec/xtend
42 interfaces between user-level programs and the TW523 X-10 controller.
43 It logs all packets received from the TW523, attempts to track the
44 status of all X-10 devices, and accepts socket connections from user-level
45 client programs that need to manipulate X-10 devices.
49 is started, it forks, releases the controlling terminal, then opens
50 its log file, where it subsequently records all X-10 activity and
51 diagnostic messages. It then begins processing packets received from
52 the TW523 and accepting connections one at a time from clients
53 wishing to issue X-10 commands.
57 startup script if enabled in
65 causes it to close and reopen its log file. This is useful
66 in shell scripts that rotate the log files to keep them from growing
72 it shuts down gracefully and exits.
77 to abort the current client connection.
80 communicates with client processes by a simple protocol in which a one-line
81 command is sent by the client, and is acknowledged by a one-line response
85 understands four types of commands:
86 .Bl -tag -width "monitor H U
90 is a single letter house code, and
92 is a numeric unit code,
95 to respond with one line of status information about the specified device.
99 is a single-letter house code,
101 is either a numeric unit code
102 or a function code (see source file
106 is a number indicating the number of times (usually 2)
107 the packet is to be transmitted without gaps,
110 to perform the specified X-10 transmission. If the transmission was apparently
111 successful, a single-line response containing
113 is issued, otherwise a single-line response containing
119 to dump the current status of all devices to an
122 directory. The response
124 is issued, regardless of whether the status dump was successful.
125 .It Ic monitor Ar H U
128 to add the current client socket connection to a list of clients that are to
129 be notified about activity concerning the specified X-10 device.
130 The single-line acknowledgement
132 is returned if the maximum (currently 5) number of such clients was not
137 then returns to its normal mode of accepting connections from clients.
138 However, each subsequent change in the status of the specified device will
141 to write one line of status information for the device (in the same
142 format as produced by the
144 command) to the saved socket. This feature is useful for writing programs
145 that need to monitor the activity of devices, like motion detectors, that can
146 perform X-10 transmissions.
154 .Bl -tag -width /var/spool/xten/status.out -compact
156 the TW523 special file
157 .It Pa /var/run/tw523
158 socket for client connections
159 .It Pa /var/run/xtend.pid
161 .It Pa /var/spool/xten/Log
163 .It Pa /var/spool/xten/Status
164 device status file (binary)
165 .It Pa /var/spool/xten/status.out
167 dump of device status
170 There is currently no timeout on client socket connections, so a hung
171 client program can prevent other clients from accessing the daemon.
174 does the best it can at trying to track device status, but there is
175 usually no way it can tell when a device has been operated manually.
176 This is due to the fact that most X-10 devices are not able to
177 respond to queries about their status.
179 .An Eugene W. Stark Aq stark@cs.sunysb.edu