与 poll() 不同，pollset 接口并不要求选择器在每次调用 select() 时复制整个文件描述符集。

Unlike poll(), the pollset interface does not require the selector to copy the entire file descriptor set each time when select() is called.

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这些bean属性作为所有bean的缺省属性复制到生成的部署描述符。

These bean attributes are copied as default attributes for all beans into the deployment descriptors generated.

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当某个进程复制它自身时，内核生成所有打开的文件描述符的副本。

When a process duplicates itself, the kernel makes a copy of all open file descriptors.

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