Linux set ip address using ioctl

static int set_ip_using(const char *name, int c, unsigned long ip)
{
    struct ifreq ifr;
    struct sockaddr_in sin;
 
    safe_strncpy(ifr.ifr_name, name, IFNAMSIZ);
    memset(&sin, 0, sizeof(struct sockaddr));
    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = ip;
    memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
    if (ioctl(skfd, c, &ifr) < 0)
	return -1;
    return 0;
}