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).
       ┌──────────────────────────┬───────────────┬─────────┐
       │ Interface                │ Attribute     │ Value   │
       ├──────────────────────────┼───────────────┼─────────┤
       │ canonicalize_file_name() │ Thread safety │ MT-Safe │
       └──────────────────────────┴───────────────┴─────────┘

CONFORMING TO

       This function is a GNU extension.

SEE ALSO

       readlink(2), realpath(3)

COLOPHON

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       information  about  reporting  bugs,  and  the  latest  version  of  this   page,   can   be   found   at
       https://www.kernel.org/doc/man-pages/.

GNU                                                2017-09-15                          CANONICALIZE_FILE_NAME(3)