从网上找的 ping 源代码

                else:
                    # time to live
                    rawPongHop = struct.unpack("s", pong[8])[0]

                    # convert TTL from 8 bit to 16 bit integer
                    pongHop = int(binascii.hexlify(str(rawPongHop)), 16)

                    # fetch pong header
                    pongHeader = pong[20:28]
                    pongType, pongCode, pongChksum, pongID, pongSeqnr = \
                              struct.unpack("bbHHh", pongHeader)

                    # fetch starttime from pong
                    starttime = struct.unpack("d", pong[28:36])[0]

                # valid ping packet received?
                if not pongSeqnr == start:
                    pong = None

            # NO data on socket - timeout waiting for answer
            if not pong:
                if alive:
                    print "no reply from %s (%s)" % (str(node), str(host))
                else:

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TAG标签:	源代码 网上 _error size print else: node str packet