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                ### 信號驅動I/O 應用進程使用 sigaction 系統調用,內核立即返回,應用進程可以繼續執行,也就是說等待數據階段應用進程是非阻塞的。內核在數據到達時向應用進程發送 SIGIO 信號,應用進程收到之后在信號處理程序中調用 recvfrom 將數據從內核復制到應用進程中。 相比于非阻塞式 I/O 的輪詢方式,信號驅動 I/O 的 CPU 利用率更高 ![](https://img.kancloud.cn/eb/01/eb01a01911537b383f8fdc62e7c0f6b3_728x406.png)
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