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If linkat(2) is called with AT_EMPTY_PATH on an AF_LOCAL or AF_UNIX socket that is not a socket file, the current code calls fhandler_disk_file::link in most cases. The latter expects to be operating on a disk file and uses the socket's io_handle, which is not a file handle. Fix this by calling fhandler_disk_file::link only if the fhandler_socket object is a file (determined by testing dev().isfs()). Also fix the case of a socket file opened with O_PATH by setting the fhandler_disk_file's io_handle.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin