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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 (/)
       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).

       ┌─────────────────────────┬───────────────┬─────────┐
       │InterfaceAttributeValue   │
       ├─────────────────────────┼───────────────┼─────────┤
       │canonicalize_file_name() │ Thread safety │ MT-Safe │
       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

       This function is a GNU extension.

SEE ALSO

       readlink(2), realpath(3)

COLOPHON

       This  page  is  part of release 5.02 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 https://www.kernel.org/doc/man-pages/.