有三个origin常量，你可以像使用功能fseek，从您的判断offset数：SEEK_SET，SEEK_CUR，和SEEK_END。SEEK_CUR并且SEEK_END似乎不言自明地表示文件流的当前位置和结尾，但是为什么SEEK_SET用来表示开头？为什么不这样SEEK_BEG呢？
因为可以添加偏移量。通过使用SEEK_SET，您可以显式设置偏移量。（通过将其添加到开头）
从fseek的联机帮助页中：
The new position, measured in bytes, is
obtained by adding offset bytes to the position specified by whence.
If whence is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is
relative to the start of the file, the current position indicator, or
end-of-file, respectively.
从lseek的联机帮助页中：
SEEK_SET
The file offset is set to offset bytes.
SEEK_CUR
The file offset is set to its current location plus offset
bytes.
SEEK_END
The file offset is set to the size of the file plus offset
bytes.
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我来说两句