51cb2d085a
A blocking accept (and some other operations) waits on &so->so_timeo. Once it wakes up, it will detect the SBS_CANTRCVMORE bit. The error from accept() is [ECONNABORTED] which is not the nicest one -- the thread calling accept() needs to know out-of-band what is happening. A spurious wakeup on so->so_timeo appears harmless (sleep retried) except when lingering on close (SO_LINGER, and in that case there is no descriptor to call shutdown() on) so this should be fairly safe. A shutdown() already woke up a blocked accept() for TCP sockets, but not for Unix domain sockets. This fix is generic for all domains. This patch was sent to -hackers@ and -net@ on April 5. MFC after: 2 weeks
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