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When a FIFO is opened, syscalls.cc:open always calls fstat on the newly-created fhandler_fifo. This results from a call to device_access_denied. To speed-up this fstat call, and therefore the open(2) call, use PC_KEEP_HANDLE when the fhandler is created. The resulting conv_handle is retained until after the fstat call if the fhandler is a FIFO; otherwise, it is closed immediately.
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