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On NetBSD, use TCP_KEEPIDLE as KEEPALIVE_OPTION. #110

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On NetBSD, use TCP_KEEPIDLE as KEEPALIVE_OPTION. #110

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Commits on Dec 12, 2020

  1. On NetBSD, use TCP_KEEPIDLE as KEEPALIVE_OPTION. 

    Without this, we saw this on NetBSD (routinator uses net2):

 13038     19 routinator CALL  setsockopt(0x15,0xffff,8,0x7d60bd3d62b4,4)
 13038     19 routinator RET   setsockopt 0
 13038     19 routinator CALL  setsockopt(0x15,6,8,0x7d60bd3d62b4,4)
 13038     19 routinator RET   setsockopt -1 errno 42 Protocol option not available

The '8' in the above corresponds to the "ifdef notyet" definition
of TCP_NOOPT, reserved for (future/possible) FreeBSD compat, and
results in the ENOPROTOOPT error return shown above.
    @he32
    he32 committed Dec 12, 2020
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