问下面的函数给出了strncpy上的分割错误，谁能解释一下为什么会发生这种分割错误？

EN

IFNAMSIZ = 16

static STATUS_CODE __bind(int sock_fd, const char *interface)
    {

            struct sockaddr sock_addr;
            memset(&sock_addr, '\0', sizeof(sock_addr));
            strncpy(sock_addr.sa_data, interface, IFNAMSIZ);
            sock_addr.sa_family = AF_PACKET;

            if (bind(sock_fd, &sock_addr, sizeof(struct sockaddr)) < 0) {
                    EPRINT("bind failed: %s", strerror(errno));
                    return FAILURE;
            }
        return SUCCESS;
}