canonicalize_file_name - return the canonicalized absolute pathname
Standard C library (
libc,
-lc)
#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).
| Interface |
Attribute |
Value |
| canonicalize_file_name () |
Thread safety |
MT-Safe |
This function is a GNU extension.
readlink(2),
realpath(3)