'listening' 事件
一旦 dgram.Socket
可寻址并且可以接收数据,则会触发 'listening'
事件。
这会在 socket.bind()
中显式地发生,或者在第一次使用 socket.send()
发送数据时隐式地发生。
直到 dgram.Socket
正在监听,底层系统资源不存在,则调用 socket.address()
和 socket.setTTL()
等将失败。
The 'listening'
event is emitted once the dgram.Socket
is addressable and
can receive data. This happens either explicitly with socket.bind()
or
implicitly the first time data is sent using socket.send()
.
Until the dgram.Socket
is listening, the underlying system resources do not
exist and calls such as socket.address()
and socket.setTTL()
will fail.