互换性，人可是是信息的发送者，也可以是信息的接收者。
Interchangeability: any human being can both be a producer and receiver of messages.
信息的发送者受到环境的刺激，然后进行编码，以便把这些刺激以信息的形式传达出去。
The sender of the information is stimulated by the environment to code in order to send the stimulus in the form of information.
结构体可用于获取发送者的 pid、uid、错误地址以及其他信息。
This structure can be used to get the sender's pid, uid, fault address, and other information.
应用推荐