August 2011
Intermediate to advanced
552 pages
23h 48m
English
Content preview from Advanced Mac OS X Programming: The Big Nerd Ranch Guide
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fseventsd
Rather than having multiple programs listening to /dev/fsevents, OS X introduces a daemon, fseventsd, that reads from the device, as shown in Figure 16.3. fseventsd coalesces the change stream into fewer events and then notifies other programs that have registered an interest in particular directories. Apple provides an API that talks to fseventsd under the hood and feeds you file system changes via a callback function whenever an interesting event happens.
Figure 16.3 fseventsd notifying a file system change
You will not be able to get events in absolutely real time because of this intermediary daemon. This is fine for most applications, ...
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