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                ~~~ #include <sys/types.h> /* See NOTES */ #include <sys/socket.h> int listen(int sockfd, int backlog); sockfd: socket文件描述符 backlog: 排隊建立3次握手隊列和剛剛建立3次握手隊列的鏈接數和 ~~~ 查看系統默認backlog ~~~ cat /proc/sys/net/ipv4/tcp_max_syn_backlog ~~~ 典型的服務器程序可以同時服務于多個客戶端,當有客戶端發起連接時,服務器調用的accept()返回并接受這個連接,如果有大量的客戶端發起連接而服務器來不及處理,尚未accept的客戶端就處于連接等待狀態,listen()聲明sockfd處于監聽狀態,并且最多允許有backlog個客戶端處于連接待狀態,如果接收到更多的連接請求就忽略。listen()成功返回0,失敗返回-1。
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