dtls1_write_message_header
static int dtls1_write_message_header(const struct hm_header_st *msg_hdr,
if (!dtls1_write_message_header(&s->d1->w_msg_hdr,
if (!dtls1_write_message_header(msg_hdr,
if (!dtls1_write_message_header(msg_hdr, 0, msg_len, p))