st_atime -- the last access time
st_atime——最后的访问时间
The two nulls indicate that we do not want to change the last access time or creation time for this file.
这两个null指出,我们不想改变这一文件的最后访问时间或者创建时间。
The atime is the last access time of a file, and each time a file is accessed, the underlying file system must record this timestamp.
atime 是最近访问文件的时间,每当访问文件时,底层文件系统必须记录这个时间戳。
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