Manpages - canonicalize_file_name.3

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.

See *realpath*(3).

For an explanation of the terms used in this section, see *attributes*(7).

This function is a GNU extension.

*readlink*(2), *realpath*(3)

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