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80b1884dc1
If fstat(2) is called on an AF_LOCAL or AF_UNIX socket that is not a socket file, the current code calls fstat_fs. 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 fstat_fs only if the fhandler_socket object is a file (determined by testing dev().isfs()).
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