Commits on Jun 22, 2021

1. Support Unix domain sockets on Windows …

   Unix domain sockets were introduced in Insider Build 17063 (Windows 10
   1803) [1]. There are some caveats, as only SOCK_STREAM is supported
   and abstract sockets are not implemented (2). The header file
   <afunix.h> declares the `struct sockaddr_un` type, but hasn't been
   picked by mingw-w64. The struct definition is embedded if the header
   wasn't found. The curl [3] project has taken that approach too.
   
   It is expected that users get runtime errors if the system doesn't
   have support for Unix domain sockets.
   
   Fixes OCaml issues#8863.
   
   [1]: https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/
   (2): microsoft/WSL issues/4240#issuecomment-620805115
   [3]: https://github.com/curl/curl/blob/curl-7_74_0/lib/config-win32.h#L725-L734

   

   MisterDA committed Jun 22, 2021
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2. Factorize code setting cloexec/inherit flag on Windows

   

   MisterDA committed Jun 22, 2021
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3. Emulate socketpair of Unix domain sockets of stream type on Windows …

   Windows does not provide an implementation of socketpair.
   This emulates the behaviour of socketpair on Unix domain sockets of
   SOCK_STREAM type.
   
   Related to ocaml/ocaml pull#9104.

   

   MisterDA committed Jun 22, 2021
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