epoll_wait的返回值

epoll_wait的返回值是成功时，返回准备就绪的文件描述符的数目；如果在请求的超时时间内没有文件描述符准备就绪，则返回0；发生错误时，返回-1并正确设置errno。该函数用于等待epoll文件描述符上的I/O事件，并将准备就绪的事件存储在events参数指向的结构体数组中。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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