instance method Socket::AncillaryData#timestamp

タイムスタンプ制御メッセージに含まれる時刻を Time オブジェクトで返します。

"タイムスタンプ制御メッセージ" は以下のいずれかです。

• SOL_SOCKET/SCM_TIMESTAMP (micro second) GNU/Linux, FreeBSD, NetBSD, OpenBSD, Solaris, MacOS X
• SOL_SOCKET/SCM_TIMESTAMPNS (nano second) GNU/Linux
• SOL_SOCKET/SCM_BINTIME (2**(-64) second) FreeBSD

require 'socket'

Addrinfo.udp("127.0.0.1", 0).bind {|s1|
  Addrinfo.udp("127.0.0.1", 0).bind {|s2|
    s1.setsockopt(:SOCKET, :TIMESTAMP, true)
    s2.send "a", 0, s1.local_address
    ctl = s1.recvmsg.last
    p ctl
    #=> #<Socket::AncillaryData: INET SOCKET TIMESTAMP 2009-02-24 17:35:46.775581>
    t = ctl.timestamp
    p t      #=> 2009-02-24 17:35:46 +0900
    p t.usec #=> 775581
    p t.nsec #=> 775581000
  }
}

[SEE_ALSO] Socket::Constants::SCM_TIMESTAMP, Socket::Constants::SCM_TIMESTAMPNS, Socket::Constants::SCM_BINTIME, Socket::Constants::SO_TIMESTAMP, Socket::Constants::SO_TIMESTAMPNS, Socket::Constants::SO_BINTIME