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XTEND(8) FreeBSD System Manager's Manual XTEND(8) NAME xtend -- X-10 daemon SYNOPSIS /usr/libexec/xtend DESCRIPTION Xtend interfaces between user-level programs and the TW523 X-10 con- troller. It logs all packets received from the TW523, attempts to track the status of all X-10 devices, and accepts socket connections from user- level client programs that need to manipulate X-10 devices. When xtend is started, it forks, releases the controlling terminal, then opens its log file, where it subsequently records all X-10 activity and diagnostic messages. It then begins processing packets received from the TW523 and accepting connections one at a time from clients wishing to issue X-10 commands. Xtend is started from /etc/rc.i386 startup script if enabled in /etc/rc.conf script. Sending xtend a SIGHUP causes it to close and reopen its log file. This is useful in shell scripts that rotate the log files to keep them from growing indefinitely. If xtend receives a SIGTERM, it shuts down grace- fully and exits. A SIGPIPE causes xtend to abort the current client con- nection. Xtend communicates with client processes by a simple protocol in which a one-line command is sent by the client, and is acknowledged by a one-line response from the daemon. Xtend understands four types of commands: status H U where H is a single letter house code, and U is a numeric unit code, causes xtend to respond with one line of status information about the specified device. send H U N where H is a single-letter house code, U is either a numeric unit code or a function code (see source file xtend/packet.c) for a list, and N is a number indicating the number of times (usually 2) the packet is to be transmitted without gaps, causes xtend to perform the specified X-10 transmission. If the transmission was apparently success- ful, a single-line response containing OK is issued, other- wise a single-line response containing ERROR is produced. dump causes xtend to dump the current status of all devices to an ASCII file in the spool directory. The response OK is issued, regardless of whether the status dump was success- ful. monitor H U causes xtend to add the current client socket connection to a list of clients that are to be notified about activity concerning the specified X-10 device. The single-line acknowledgement OK is returned if the maximum (currently 5) number of such clients was not exceeded, otherwise ERROR is returned. Xtend then returns to its normal mode of accept- ing connections from clients. However, each subsequent change in the status of the specified device will cause xtend to write one line of status information for the device (in the same format as produced by the status command) to the saved socket. This feature is useful for writing pro- grams that need to monitor the activity of devices, like motion detectors, that can perform X-10 transmissions. OPTIONS None. SEE ALSO xten(1), tw(4) FILES /dev/tw0 the TW523 special file /var/run/tw523 socket for client connections /var/run/xtend.pid pid file /var/spool/xten/Log log file /var/spool/xten/Status device status file (binary) /var/spool/xten/status.out ASCII dump of device status BUGS There is currently no timeout on client socket connections, so a hung client program can prevent other clients from accessing the daemon. Xtend does the best it can at trying to track device status, but there is usually no way it can tell when a device has been operated manually. This is due to the fact that most X-10 devices are not able to respond to queries about their status. AUTHORS Eugene W. Stark <stark@cs.sunysb.edu> FreeBSD 11.1 October 30, 1993 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | FILES | BUGS | AUTHORS
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