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POLLHUP polling
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== MSYS2 on Windows == On MSYS2 in 2022 polling a closed socket will return: * POLLIN if checking * POLLOUT if checking This is regardless of whether there is data in the socket to read. MSYS2 does not have any specific man pages. Leaving the events bitmask empty causes poll to timeout. This makes sense because the implementation is emulating select using poll. The history for MSYS2's behaviour is as follows: * 2000: [https://www.cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=afb7e7196a6dc16c145a455d6cf0761cbaeb7a48 Cygwin implements the poll system call]. POLLHUP is set as a single event if a file descriptor is closed * 2002: [https://www.cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=7382e593a01ee81cea5df91a77a9868281de8c04 Cygwin peeks sockets]. POLLHUP is now set if a socket is closed * 2005: [https://www.cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=6ba3f6bb2d088c7b5ffc84a6ed74ad3d525fde37 Cygwin switches to POLLIN when peeking]. POLLHUP is now only set if a file descriptor is closed *2011: [https://www.cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=0077cd1016c8414f6175f8e94f97be9ea4506bea Cygwin checks socket shutdown status]. POLLHUP is now generated if a socket is shutdown *2018: [https://www.cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=b79018ee3a36140a82e2dfa2d7a71fc0bf15d892 Cygwin only detects Winsock socket shutdowns]. Now POLLHUP no longer applies to AF_UNIX sockets
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