获取详细网卡信息，请参考ioctl

net/if.h 等相关文件与帮助。

 

 

struct if_nameindex * ifni, *p;

  int fd, numreqs = 30, n, err = -1;   struct ifconf ifc;   struct ifreq *ifr;

  if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) < 0){

    perror ("socket");     exit (1);   }

  ifc.ifc_buf = NULL;

  for (;;) {     ifc.ifc_len = sizeof (struct ifreq) * numreqs;     ifc.ifc_buf = realloc(ifc.ifc_buf, ifc.ifc_len);

    if (ioctl (fd, SIOCGIFCONF, &ifc) < 0) {

      perror ("SIOCGIFCONF");       goto out;     }

    if (ifc.ifc_len == sizeof (struct ifreq) *numreqs) {

    /* assume it overflowed and try again */       numreqs += 10;       continue;     }     break;   }   close (fd);

  //uint32_t ip; 

  int i;                                                             char ip_str[INET_ADDRSTRLEN];   ifr = ifc.ifc_req;   for (i = 0, n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq), i++) {     /*     if (getifaddr (AF_INET, ++i, ifr->ifr_name, &ip) == -1){       perror ("getifaddr failed");       exit (2);     }     */ //ifreq结构已经有了,ip已经存放在里面了     printf ("Index: %d,/tInterface: %s,/tIP: %s/n", i,             ifr->ifr_name, inet_ntop (AF_INET, &((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr, ip_str, sizeof (ip_str)));     ifr++;   }

 out:

  free(ifc.ifc_buf);

  return 0;