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Joey Hess 2012-06-17 02:08:28 -04:00
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doc/design/assistant/inotify.mdwn
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@ -20,9 +20,12 @@ I'd also like to support OSX and if possible the BSDs.
* kqueue ([haskell bindings](http://hackage.haskell.org/package/kqueue)) * kqueue ([haskell bindings](http://hackage.haskell.org/package/kqueue))
is supported by FreeBSD, OSX, and other BSDs. is supported by FreeBSD, OSX, and other BSDs.
From what I can find, kqueue does not provide full directory watching In kqueue, to watch for changes to a file, you have to have an open file
capabilities. To watch a file, you have to have an open file descriptor descriptor to the file. This wouldn't scale.
to the file. This wouldn't scale.
Apparently, a directory can be watched, and events are generated when
files are added/removed from it. You then have to scan to find which
files changed. [example](https://developer.apple.com/library/mac/#samplecode/FileNotification/Listings/Main_c.html#//apple_ref/doc/uid/DTS10003143-Main_c-DontLinkElementID_3)
Gamin does the best it can with just kqueue, supplimented by polling. Gamin does the best it can with just kqueue, supplimented by polling.
The source file `server/gam_kqueue.c` makes for interesting reading. The source file `server/gam_kqueue.c` makes for interesting reading.
@ -30,6 +33,12 @@ I'd also like to support OSX and if possible the BSDs.
([haskell bindings](http://hackage.haskell.org/package/hlibfam) for FAM; ([haskell bindings](http://hackage.haskell.org/package/hlibfam) for FAM;
gamin shares the API) gamin shares the API)
kqueue does not seem to provide a way to tell when a file gets closed,
only when it's initially created. Poses problems..
* [man page](http://www.freebsd.org/cgi/man.cgi?query=kqueue&apropos=0&sektion=0&format=html)
* <https://github.com/gorakhargosh/watchdog/blob/master/src/watchdog/observers/kqueue.py> (good example program)
* hfsevents ([haskell bindings](http://hackage.haskell.org/package/hfsevents)) * hfsevents ([haskell bindings](http://hackage.haskell.org/package/hfsevents))
is OSX specific. is OSX specific.
@ -40,8 +49,12 @@ I'd also like to support OSX and if possible the BSDs.
This will be harder for me to develop for, since I don't have access to This will be harder for me to develop for, since I don't have access to
OSX machines.. OSX machines..
[This perl module](http://search.cpan.org/~agrundma/Mac-FSEvents-0.02/lib/Mac/FSEvents/Event.pm) hfsevents does not seem to provide a way to tell when a file gets closed,
has the best description I've found of what the flags mean. only when it's initially created. Poses problems..
* <https://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/FSEvents_ProgGuide/Introduction/Introduction.html>
* <http://pypi.python.org/pypi/MacFSEvents/0.2.8> (good example program)
* <https://github.com/gorakhargosh/watchdog/blob/master/src/watchdog/observers/fsevents.py> (good example program)
* Windows has a Win32 ReadDirectoryChangesW, and perhaps other things. * Windows has a Win32 ReadDirectoryChangesW, and perhaps other things.