[Bug 220459] lio_listio(2) doesn't support SIGEV_THREAD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220459

            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 at FreeBSD.org
          Reporter: asomers at FreeBSD.org

lio_listio(2) returns EINVAL when its sig->sigev_notify is SIGEV_THREAD.  That
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_ supported.
 For other aio(4) functions, SIGEV_THREAD is handled in librt and implemented
using SIGEV_THREAD_ID, which is what the kernel actually sees.  But lio_listio
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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