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Subject: [Bug 220459] lio_listio(2) doesn't support SIGEV_THREAD
Date: Mon, 03 Jul 2017 22:07:26 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: CURRENT
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X-Bugzilla-Severity: Affects Some People
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220459

            Bug ID: 220459
           Summary: lio_listio(2) doesn't support SIGEV_THREAD
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

lio_listio(2) returns EINVAL when its sig->sigev_notify is SIGEV_THREAD.  T=
hat
error gets returned from kern_lio_listio.  The lio_listio(2) man page makes=
 no
mention of this limitation.  In fact, it says that SIGEV_THREAD _is_ suppor=
ted.
 For other aio(4) functions, SIGEV_THREAD is handled in librt and implement=
ed
using SIGEV_THREAD_ID, which is what the kernel actually sees.  But lio_lis=
tio
doesn't go through librt.  Instead, it's a direct syscall.

Either the man page should be updated, or lio_listio should gain a librt
wrapper just like aio_read(2) and friends.

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