Linux get NIC Information

#include <sys/ioctl.h> #include <net/if.h> #include <unistd.h> #include <netinet/in.h>#    Include <string.h> int main () {struct ifreq IFR;    struct ifconf ifc;    Char buf[2048];     int success = 0;    int sock = socket (af_inet, SOCK_DGRAM, IPPROTO_IP);        if (sock = =-1) {printf ("Socket error\n");    return-1;    } Ifc.ifc_len = sizeof (BUF);    Ifc.ifc_buf = BUF;        if (IOCTL (sock, siocgifconf, &ifc) = =-1) {printf ("ioctl error\n");    return-1;    } struct ifreq* it = ifc.ifc_req;    const struct ifreq* Const END = it + (ifc.ifc_len/sizeof (struct ifreq));    Char szmac[64];    int count = 0;        for (; it! = end; ++it) {strcpy (ifr.ifr_name, it->ifr_name); if (IOCTL (sock, siocgifflags, &ifr) = = 0) {if (! (Ifr.ifr_flags & Iff_loopback))                    {//don ' t count Loopback if (IOCTL (sock, siocgifhwaddr, &ifr) = = 0) {count + +; Unsigned char * PTR;                    ptr = (unsigned char *) &ifr.ifr_ifru.ifru_hwaddr.sa_data[0];                    snprintf (szmac,64, "%02x:%02x:%02x:%02x:%02x:%02x", *ptr,* (ptr+1), * (ptr+2), * (ptr+3), * (PTR+4), * (ptr+5));                printf ("%d,interface name:%s, MAC address:%s \ n", Count,ifr.ifr_name,szmac);            }}}else{printf ("Get Mac info error\n");        return-1; }    }}

Linux get NIC Information