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The field st_mtime is changed by file modifications, e.g. by mknod(2), truncate(2),
utime(2) and write(2) (of more than zero bytes). Moreover, st_mtime of a directory
is changed by the creation or deletion of files in that directory. The st_mtime
field is not changed for changes in owner, group, hard link count, or mode.
The field st_ctime is changed by writing or by setting inode information (i.e.,
owner, group, link count, mode, etc.).
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