Connor Sughrue 203232ffbd [llvm][Support] ListeningSocket::accept returns operation_canceled if FD is set to -1 (#89479) ...

If `::poll` returns and `FD` equals -1, then `ListeningSocket::shutdown`
has been called. So, regardless of any other information that could be
gleaned from `FDs.revents` or `PollStatus`, it is appropriate to return
`std::errc::operation_canceled`. `ListeningSocket::shutdown` copies
`FD`'s value to `ObservedFD` then sets `FD` to -1 before canceling
`::poll` by calling `::close(ObservedFD)` and writing to the pipe.

2024-05-21 20:32:11 -04:00

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