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Sergey Kandaurov
5b8a5c08ce
The support first appeared in OS X Mavericks 10.9 and documented since OS X Yosemite 10.10. It has a subtle implementation difference from other operating systems in that the TCP_KEEPALIVE socket option (used in place of TCP_KEEPIDLE) isn't inherited from a listening socket to an accepted socket. An apparent reason for this behaviour is that it might be preserved for the sake of backward compatibility. The TCP_KEEPALIVE socket option is not inherited since appearance in OS X Panther 10.3, which long predates two other TCP_KEEPINTVL and TCP_KEEPCNT socket options. Thanks to Andy Pan for initial work.