49   void *bufs[BUFS];  in main()  local
59   iovs = (struct iovec *)malloc(sizeof(bufs) / sizeof(bufs[0]) *  in main()
65   bufs[MAGIC] = mmap((void *)(0x45678000), PAGE_SIZE, PROT_READ | PROT_WRITE,  in main()
67   if (bufs[MAGIC] == MAP_FAILED) {  in main()
71   for (size_t i = 0; i < sizeof(bufs) / sizeof(bufs[0]); i++) {  in main()
73     bufs[i] = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE,  in main()
75     if (bufs[i] == MAP_FAILED) {  in main()
79     iovs[i].iov_base = bufs[i];  in main()
84   iovs[MAGIC].iov_base = bufs[MAGIC];  in main()
90     write(fd[1], bufs[0], PAGE_SIZE);  in main()
100   for (size_t i = 0; i < sizeof(bufs) / sizeof(bufs[0]); i++) {  in main()
101     if (bufs[i]) munmap(bufs[i], PAGE_SIZE);  in main()