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34b1447040
NtQueryInformationFile hangs if it's called on the read side handle of a pipe while another thread or process is performing a blocking read. Avoid select potentially hanging by calling NtQueryInformationFile only on the write side of the pipe and using PeekNamedPipe otherwise. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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