I've written a quick package to take advantage of the Linux directory modification facility.

What this means is that you can open a directory, register your interest, and have an asynchronous script invoked when a file is added to, modified in, deleted from  that directory.

I have it in mind to use this under tclhttpd.

You can get the package here: http://sourceforge.net/projects/libtclpq/

Documentation available here: http://sourceforge.net/docman/display_doc.php?docid=11924&group_id=18733

Written with [CriTcl].

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[AK] - Now this is a useful thing. Note that the documentation
about directory notification [http://www.linuxhq.com/kernel/v2.4/doc/dnotify.txt.html]
mentions that this can trigger when files in a directory change.
In other words, this can be used to write a more efficient [tail].

Also note that this is restricted to Linux kernel 2.4 and higher.

Regarding the described interface of dnotify I have one nit:
That the caller is burdened with the task to extract the fd
to watch out of a channel handle. A better interface ([IMHO])
would be to accept channel handles and have the C code determine
the file handle (There are functions in the Tcl C API for this:
Tcl_GetChannelHandle [IIRC]). Channel handles for non-files (like
sockets) would simply cause the command to throw an error.

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[Category Package]
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