Блокировка ioctl

int sd;

sd = socket(AF_INET, SOCK_DGRAM, 0); DBG("socket : %i\n", sd);

if(sd > 0)
{
	struct ifconf ifconf;
	struct ifreq ifreq[CFG_NETWORK_MAXIFCS]={0};
	int interfaces;
	int i,rc;

	memset(&ifconf, 0, sizeof(struct ifconf));

	// Point ifconf's ifc_buf to our array of interface ifreqs.
	//ifconf.ifc_buf = (char *) ifreq;
	ifconf.ifc_ifcu.ifcu_buf = (caddr_t)ifreq;

	// Set ifconf's ifc_len to the length of our array of interface ifreqs.
	ifconf.ifc_len = sizeof(ifreq);

	DBG("ioctl start: %u\n", ifconf.ifc_len );

	//  Populate ifconf.ifc_buf (ifreq) with a list of interface names and addresses.
	if ((rc=ioctl(sd, SIOCGIFCONF, &ifconf)) < 0 )
	{
		DBG("ioctl error: %i\n", rc );
		goto error;
	}

	DBG("ioctl complete\n");