6.2 BSD systems
When compiled on BSD systems (including Darwin),
kqueue (see kernel event
notification mechanism in kqueue(2) man page).
This interface needs an open file handle for each file in a monitored directory, which means that the number of watchers is limited by the maximum number of open files. Use ‘ulimit -n NUM’ in order to raise it to a higher number.
Since it operates on files,
kqueue does not provide direct
support for the ‘create’ generic event.
over this disadvantage by keeping track of the contents of each
monitored directory and rescanning it each time a ‘WRITE’ system
event is reported for it. It then generates the ‘open’ event for
each file that appeared after the last scan. Such a rescan can
consume considerable time if a directory has a very large number of
files in it.
The following system-dependent events are available:
The file was renamed.
Access to the file was revoked via
revoke()(see revoke file access in revoke(2) man page) or the underlying file system was unmounted.
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