1 Client Socket Programming (Review)

2 Server Sockets

2.1 Binding a Socket: bind()

1.int bind(int socket, const struct sockaddr *address, socklen_t address_len);

2.2 Queuing incoming connections: listen()

int listen(int socket, int backlog);
backlog是指listen等待的connect的个数,accept会减少listen等待的个数,如果多于这个个数则拒绝

2.3 Accepting Incoming Connections: accept()

1.int accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len);
2. accept返回一个文件描述符
3. server socket的文件描述符仍然存在,这样就可以接受更多的连接
4.accept的文件描述符和server socket的文件描述符不相同
5.accept会开启新的端口,而server socket则需要保证端口不变来接收新的连接
6.accept是阻塞的,直到有新的连接进来

2.4 Communicating with the Client: read()/write()/close()

2.5 Putting it all together

3 Handling Multiple Incoming Connections of Server Sockets

3.1 Challenge of blocking

3.2 Identifying Readable File Descriptors with select()

参考:
https://www.usna.edu/Users/cs/aviv/classes/ic221/s16/lec/27/lec.html#coderef-bad_ref

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