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POSIX requires atomicity for non-blocking writes <= PIPE_BUF bytes and writing of at least 1 byte if any buffer space is left. Windows NtWriteFile returns STATUS_SUCCESS and "0 bytes written" if the write doesn't match buffer space. Fix this discrepancy. 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