xttpd - Harmonic tide clock and tide predictor (web server)

xttpd [port]

XTide is a package that provides tide and current predictions in a wide variety of formats. Graphs, text listings, and calendars can be generated, or a tide clock can be provided on your desktop.

XTide can work with X-windows, plain text terminals, or the web. This is accomplished with three separate programs: the interactive interface (xtide), the non-interactive or command line interface (tide), and the web interface (xttpd).

xttpd is an XTide web server. It provides web-based access to XTide's tide predictions by allowing a web browser to speak directly to the XTide program in HTTP. xttpd can replace httpd or it can co-exist with one.

If you run xttpd with no command line arguments, it will assume that it is replacing httpd and try to bind port 80. If you want it to co-exist with an existing server, or if you do not have privilege to get port 80, give it the port number as the first command line argument: % xttpd 8080 You will then need to link it up as http://www.wherever.org:8080/ instead of just http://www.wherever.org/, but otherwise, no damage done. Similarly, if you wish to bind a specific address, you can specify that as the first argument: % xttpd 127.0.0.2 If you need to specify both address and port number, separate the two with a slash, like this: % xttpd 127.0.0.2/8080

xttpd will try to set its UID to 'nobody' once the port is established, but will issue a warning and continue with the default user ID if this fails.

For a complete discussion of the command line options and a detailed explanation of the XTide package, please see the verbose documentation at http://www.flaterco.com/xtide/.

Unless a configuration file /etc/xtide.conf is supplied, you must set the environment variable HFILE_PATH to point to the harmonics files that should have been installed along with the xtide program. Example: export HFILE_PATH=/usr/local/share/xtide/harmonics.tcd If a configuration file is used, the first line should consist of the colon-separated list of harmonics files (e.g. the HFILE_PATH line above without the "export HFILE_PATH=" part). The environment variable takes precedence over the configuration file.

On Debian systems the web server xttpd may optionally be started at boot time by editing /etc/init.d/xttpd (setting the PORT variable and uncommenting out the line). Set the environment variable XTTPD_FEEDBACK in /etc/init.d/xttpd to change the mail feedback address.

Also, note that on Debian systems the tidal harmonics data file are stored in /usr/share/xtide instead of /usr/local/share/xtide as used above.

tide(1), xtide(1), http://www.flaterco.com/xtide/.