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For example, the socket "foo.sock" should > have the same ownership and similar permissions to other files > in the example below: > > $ ls -lrt > total 2181303 > > -rw-r--r--  1 mimcmah      None             1259   Sep 23 10:22 test.c > -rwxr-xr-x  1 mimcmah      None             3680   Sep 23 10:22 test.obj > -rwxr-xr-x  1 mimcmah      None             121344 Sep 23 10:22 test.exe > -rw-r-----  1 Unknown+User Unknown+Group         0 Sep 23 10:23 foo.sock > -rw-r--r--  1 mimcmah      None             144356 Sep 23 10:27 check.ot > > A bigger problem is that foo.sock can't be deleted with the cygwin "rm" > command. > > $ rm -f foo.sock > rm: cannot remove 'foo.sock': Permission denied > > $ chmod 777 foo.sock > chmod: changing permissions of 'foo.sock': Permission denied > > $ cmd /c del foo.sock > > But, native Windows commands are okay, as the third example shows. > > I think the problem may relate to the way native Unix domain sockets are > implemented in Windows and the resulting special handling required. > They are implemented as NTFS reparse points and when opening them > with CreateFile, you need to specify the FILE_FLAG_OPEN_REPARSE_POINT > flag. Otherwise, you get an ERROR_CANT_ACCESS_FILE. There are other > complications unfortunately, which I'd be happy to discuss further. > > But, to reproduce it, you can compile the attached code snippet > which creates foo.sock in the current directory. Obviously, this > only works on recent versions of Windows 10 and 2019 server. Cygwin doesn't currently support native Windows AF_UNIX sockets, as you've discovered. See https://cygwin.com/pipermail/cygwin/2020-June/245088.html for the current state of AF_UNIX sockets on Cygwin, including the possibility of using native Windows AF_UNIX sockets on systems that support them. If all you want is for Cygwin to recognize such sockets and allow you to apply rm, chmod, etc., I don't think it would be hard to add that capability. But I doubt if that's all you want. Further discussion of this will have to wait until Corinna is available. Ken