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自己找到了答案,但是还没有解决办法。。。。。。
重定向应该是通过管道实现,pipe()调用会改变ctime和mtime。
man stat
st_atime
Time when file data was last accessed. Changed by the
following functions: creat(), mknod(), pipe(),
utime(2), and read(2).
st_mtime
Time when data was last modified. Changed by the fol-
lowing functions: creat(), mknod(), pipe(), utime(),
and write(2).
st_ctime
Time when file status was last changed. Changed by the
following functions: chmod(), chown(), creat(),
link(2), mknod(), pipe(), unlink(2), utime(), and
write().
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