* ext/socket/option.c (inspect_tcp_info): New function to inspect struct tcp_info.
  (sockopt_inspect): Use inspect_tcp_info.

* ext/socket/extconf.rb: Check tcp_info related things.

* ext/socket/rubysocket.h: Include netinet/tcp_fsm.h if available.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46017 b2dd03c8-39d4-4d8f-98ff-823fe69b080e