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Catfish_Man · Aug 19, 2003, 03:12 PM

A friend of mine and I are writing a program that needs a fast way of finding out when the filesystem changes (and what changed). The few responses I've gotten on other forums have made me think that the addition of kqueue/kevent support in 10.3 is what I'm looking for. That leaves the questions:
1) How would I use kqueue/kevent to get filesystem changed notifications
2) Is there any pre-10.3 method for doing this (not a big deal, but nice to know if there is)

smeger · Aug 20, 2003, 01:54 AM

No clue about the new kernel stuff, but take a look at the FNNotify stuff in Files.h.

Angus_D · Aug 20, 2003, 07:21 AM

FNNotify won't do what he wants.

Catfish_Man · Aug 20, 2003, 12:11 PM

Yeah, we saw that one (actually made a little test app for it), but to get what happened, as well as whether something happened, we'd have to subscribe to every directory, then scan the directory if it changed. That's... less than ideal. Also, it only seems to work when the app is in the foreground, which is not so great for an app that runs only in the background. Thanks anyway though, that's the most useful response I've gotten out of 3 forums and an email.

smeger · Aug 20, 2003, 01:49 PM

Here's some private API stuff.

Angus_D · Aug 20, 2003, 04:38 PM

Originally posted by smeger:
Here's some private API stuff.

CPS is basically the underlying framework for the process manager, built into the window manager. I don't see the connection with filesystem notifications

smeger · Aug 20, 2003, 06:20 PM

Originally posted by Angus_D:
CPS is basically the underlying framework for the process manager, built into the window manager. I don't see the connection with filesystem notifications

Quoting from my link above:

There are already some constants (CPSNotificationCodes) defined in CPS.h related the these notifications, which lets anobody think that some process could be notified for another application's launch start, launch complete, death.... but with far more flexibility than with CarbonEvents.

I've never used this stuff, so I have no clue if this is correct or not. But hopefully, it's helpful.

Heh, I just realized that the original poster wants filesystem notifications, not app launch/quit notifications. I think I need to brush up on my reading skills. Please disregard absolutely everything I've said.