RecorderEventNotifyGet writes
the event mask into the structure pointed to by eventMask,
and also writes it into the implementation-specific structure pointed
to by external (if external is not NULL).
(The event mask specifies the event type(s) generated by a Recorder
(recorder), for which host notification has been requested.)
The event mask information in external is in addition
to the event mask information in eventMask, i.e, the
mask information in eventMask and in external
is not the same mask information. Note that eventMask
or external can be NULL (but not both NULL).
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