if ("/etc"->file_exists ()) ...                                                /* "ERR_NOT_A_FILE" */

if ("/etc"->directory_exists ()) ...                                           /* "ERR_NOT_A_DIRECTORY" */

if ("/etc"->link_exists (FS_DIR)) ...                                          /* 1 */

if ("/etc"->link_exists (FS_FILE)) ...                                         /* "ERR_NOT_A_FILE_LINK" */