al_get_file_userdata(3)                                al_get_file_userdata(3)

NAME
       al_get_file_userdata - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              void *al_get_file_userdata(ALLEGRO_FILE *f)


DESCRIPTION
       Returns a pointer to the custom userdata that is attached to the file
       handle.  This is intended to be used by functions that extend
       ALLEGRO_FILE_INTERFACE(3).

Allegro reference manual                               al_get_file_userdata(3)