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Use WSAIoctl(SIO_KEEPALIVE_VALS) on older systems. Make sure that keep-alive timeout is equivalent to TCP_KEEPIDLE + TCP_KEEPCNT * TCP_KEEPINTVL on older systems, even with TCP_KEEPCNT being a fixed value on those systems. 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