NAME¶

canonicalize_file_name - return the canonicalized absolute pathname

LIBRARY¶

Standard C library (libc, -lc)

SYNOPSIS¶

#define _GNU_SOURCE         /* See feature_test_macros(7) */
#include <stdlib.h>

char *canonicalize_file_name(const char *path);

DESCRIPTION¶

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);

RETURN VALUE¶

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.

ERRORS¶

See realpath(3).

ATTRIBUTES¶

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

STANDARDS¶

This function is a GNU extension.

SEE ALSO¶

readlink(2), realpath(3)