Operations must give an absolute position in the file to read to or write from.
操作必须给出进行读或写的文件中的绝对位置。
Depending on the flavor of UNIX, the size of the file might also be reported as the current position the application is reading in the file (offset).
根据UNIX版本的不同,可能将文件的大小报告为应用程序在文件中进行读取的当前位置(偏移量)。
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