These constants are usually defined in netinet/tcp.h but are not defined anywhere in cygwin.
As a result there does not seem to be a way to enable the socket level keep alives in cygwin. One result of this is curl's --keepalive-time option does not work, but it would affect any attempt to enable socket keep alives. Windows' sockets do support keep alives, and indeed the win32 version of curl works correctly. Can someone explain why the TCP keep alive constants are not defined? Is it possible to add this functionality? Where in the cygwin source code does the actual posix socket to winsock translation take place? -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
