OFFSET. Return -1 if we couldn't allocate memory at ADDR, return 0
if the memory is allocated but the data not loaded, return 1 if done. */
int (*gt_pch_use_address) (void *addr, size_t size, int fd, size_t offset);
OFFSET. Return -1 if we couldn't allocate memory at ADDR, return 0
if the memory is allocated but the data not loaded, return 1 if done. */
int (*gt_pch_use_address) (void *addr, size_t size, int fd, size_t offset);