Listen Back
- listen to the port, waiting clients to connect
- based on TCP, there are two queues: one is for already connected clients, and the other is for not connected yet.
method
int listen(int sockfd, int qlen)
parameters
- sockfd: socket描述符
- qlen: 偵聽socket能處理的最大併發鏈接數
return value
- 0: success
- -1: failure
- errno: wrong code