int mmap_full_file(const char *filename, int open_mode, void **map,
size_t *size, int *fd_ptr);
int osl_munmap(void *start, size_t length);
int mmap_full_file(const char *filename, int open_mode, void **map,
size_t *size, int *fd_ptr);
int osl_munmap(void *start, size_t length);