25 	size_t i, sz;  in main()  local
33 	sz = sizeof(buf);  in main()
34 	offset = 4LL * 1024LL * 1024LL * 1024LL - sz/2;  in main()
38 	memset(buf, 0, sz);  in main()
39 	if (write(fd, buf, sz) != sz)  in main()
50 	for (i = 0; i < sz; i++)  in main()
52 	if (munmap(p, sz) == -1)  in main()
59 	if (read(fd, buf, sz) != sz)  in main()
61 	for (i = 0; i < sz; i++)  in main()
68 	if (read(fd, buf, sz) != sz)  in main()
70 	for (i = 0; i < sz; i++)  in main()