MMAP_REGION_STRUCT_SIZE 4244 src/buffer.c        ((struct mmap_region *) ((char *) (P) - MMAP_REGION_STRUCT_SIZE))
MMAP_REGION_STRUCT_SIZE 4250 src/buffer.c        ((void *) ((char *) (P) + MMAP_REGION_STRUCT_SIZE))
MMAP_REGION_STRUCT_SIZE 4387 src/buffer.c     map = ROUND (nbytes + MMAP_REGION_STRUCT_SIZE, mmap_page_size);
MMAP_REGION_STRUCT_SIZE 4455 src/buffer.c         size_t room = r->nbytes_mapped - MMAP_REGION_STRUCT_SIZE;