How to get network device MAC address under Linux __linux

Get Network Device MAC address:/* Create socket,ifreq*/int sock = 0x00; if ((sock = socket (af_inet, sock_stream, 0)) < 0) {#if DEBUG cout<< "Get MAC address-Create socket failed" &L          t;<endl;     #endif return-0x02; }
struct Ifreq mifreq; strcpy (Mifreq ifr_name, "eth0");
/* Get mac*/if (IOCTL (sock, SIOCGIFHWADDR, &mifreq) < 0) {#if DEBUG cout<< "Get MAC address-obtained          Mac Failed "<<endl;          #endif Close (sock);     return 0x01; }
/* The MAC address is assigned/memcpy ((void *) Macbuff, (void *) mifreq. Ifr_hwaddr Sa_data, 0x06);
3. When the process manager processes, Argv[0] represents the first parameter, and argv[1 is the first parameter when manually started.