canonicalize_file_name - return the canonicalized absolute pathname
The canonicalize_file_name() function returns a null-terminated string containing the canonicalized absolute pathname corresponding to
path. In the returned string, symbolic links are resolved, as are
.. pathname components. Consecutive slash (
/) characters are replaced by a single slash.
canonicalize_file_name(path) is equivalent to the call:
This function is a GNU extension.
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