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文件描述符默认以共享读/写/删除模式打开。这有效地映射了 POSIX 语义，并允许在使用句柄时删除文件。它不完全相同，一些平台差异仍然存在。在删除之后，将阻塞文件名条目，直到所有打开的句柄都已关闭。
