canonicalize_file_name - return the canonicalized absolute pathname
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>
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 canonicalize_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:
realpath(path, NULL);
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 error.