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                Socket 起源于 Unix,而Unix基本哲學之一就是一切皆文件,都可以用“打開open –&gt; 讀寫write/read –&gt; 關閉close”模式來操作。Socket就是該模式的一個實現,網絡的Socket數據傳輸是一種特殊的I/O,Socket也是一種文件描述符 通信模型: ![](https://img.kancloud.cn/a0/73/a073f084edd7f95a7c637f2f514752d6_632x802.png) server的生命周期大致如下: 1. 創建socket。 2. 綁定(bind)地址端口 3. 監聽網絡連接 4. 接受連接 5. 關閉連接 clinet的生命周期則稍微簡單點: 1. 創建socket 2. 綁定地址 3. 發起連接 4. 關閉連接 ![](https://img.kancloud.cn/ac/2f/ac2f33f00207c646a25d00896aa91487_784x241.png) ### TCP常見套接字接口函數 ![](https://img.kancloud.cn/38/29/3829ff83f5610ad866c845f0eb01ea55_663x323.png)
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