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Programs inspecting a TCP socket see both option bits clear even when the peer negotiated timestamps and selective acknowledgments. Return the flags the TCP endpoint uses to send timestamps and SACK blocks. Exercise each combination on an accepted socket. Check the options in the SYN-ACK before comparing them with getsockopt(TCP_INFO) on that connection.
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Programs inspecting a TCP socket see both option bits clear even when
the peer negotiated timestamps and selective acknowledgments. Return
the flags the TCP endpoint uses to send timestamps and SACK blocks.
Exercise each combination on an accepted socket. Check the options in
the SYN-ACK before comparing them with getsockopt(TCP_INFO) on that
connection.