int fd = open("/dev/mem", O_RDWR);
present = (unsigned char *)mmap(0,
getpagesize(),
PROT_READ|PROT_WRITE,
MAP_SHARED,
fd,
0x22400000);
if ((*present & 1) == 0)
{
printf("Converter not present\n");
exit(1);
}
1) 上記のコードの「&」演算子は何を意味しますか?