CANONICALIZE_FILE_NAME(3)           Linux Programmer's Manual           CANONICALIZE_FILE_NAME(3)



NAME
       canonicalize_file_name - return the canonicalized absolute pathname

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 (/) charac‐
       ters 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).

CONFORMING TO
       This function is a GNU extension.

SEE ALSO
       readlink(2), realpath(3)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of  this  page,  can  be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2013-05-11                  CANONICALIZE_FILE_NAME(3)