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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.

int listen(int sockfd, int qlen)
  • 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
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