Wait on event occurrences with the select() (or a blocking read()) system call.

使用 select()（或阻塞的 read()）系统调用等待事件发生。

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There are several conditions which cause select() or a blocking read() to return.

几种情况会导致 select() 或阻塞的 read() 返回。

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Once the monitoring application attempts another select or blocking read , those calls will return immediately since there is unread event occurrence data waiting in the buffer.

当监视应用程序试图执行另一次select或阻塞的read调用时，这些调用会立即返回，因为缓冲区中有未读的事件发生数据。

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