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#define _GNU_SOURCE /* See feature_test_macros(7) */
char *canonicalize_file_name(const char *path);
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 . and ..
pathname components. Consecutive slash (/) characters are replaced by
a single slash.
The returned string is dynamically allocated by canonical-
ize_file_name() and the caller should deallocate it with free(3) when
it is no longer required.
The call canonicalize_file_name(path) is equivalent to the call:
On success, canonicalize_file_name() returns a null-terminated string.
On error (e.g., a pathname component is unreadable or does not exist),
canonicalize_file_name() returns NULL and sets errno to indicate the
This function is a GNU extension.
GNU 2013-05-11 CANONICALIZE_FILE_NAME(3)