https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251515
Bug ID: 251515
Summary: lio_listio(2) never sends kevent if nent==0
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
It may seem stupid, but you can call lio_listio(2) with an empty aiocb list. I
would naively expect lio_listio to do nothing and return in that case. Indeed,
that's what it does when mode == LIO_WAIT. However, if mode == LIO_NOWAIT and
sigev_notify == SIGEV_KEVENT, no event is ever delivered.
The problem can be demonstrated by the
sys/aio/lio_test:lio_listio_empty_nowait_kevent test case.
Since the Open Group's AIO specification never mentions kevent, we get to make
the call on what to do. jhb and I agree that sending immediate notification is
sensible.
This was originally reported as bug 220398, but that bug really turned out to
be two bugs.
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