msg the MSG part of the message (aka “the message” ;)) message 的MSG 部分 rawmsg the message excactly as it was received from the socket. Should be useful for debugging. It is also useful if a message should be forwarded totally unaltered. 完整的消息从socket接受,对于debugging是有用的,它对于如果一个消息需要被完全不变的转发也是有用的