Date: Wed, 02 Dec 2020 00:50:09 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 251515] lio_listio(2) never sends kevent if nent==0 Message-ID: <bug-251515-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org 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. -- You are receiving this mail because: You are the assignee for the bug.help
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