Function peer_start_closingd

lightningd/closing_control.c:352–515

}

void peer_start_closingd(struct channel *channel, struct peer_fd *peer_fd)
{
	u8 *initmsg;
	u32 min_feerate, feerate, *max_feerate;
	struct amount_msat their_msat;
	struct amount_sat feelimit;
	int hsmfd;
	struct lightningd *ld = channel->peer->ld;
	u32 final_commit_feerate;
	bool option_anchor_outputs = channel_has(channel, OPT_ANCHOR_OUTPUTS);

	if (!channel->shutdown_scriptpubkey[REMOTE]) {
		channel_internal_error(channel,
				       "Can't start closing: no remote info");
		return;
	}

	hsmfd = hsm_get_client_fd(ld, &channel->peer->id, channel->dbid,
				  HSM_CAP_SIGN_CLOSING_TX
				  | HSM_CAP_COMMITMENT_POINT);

	channel_set_owner(channel,
			  new_channel_subd(channel, ld,
					   "lightning_closingd",
					   channel, &channel->peer->id,
					   channel->log, true,
					   closingd_wire_name, closing_msg,
					   channel_errmsg,
					   channel_set_billboard,
					   take(&peer_fd->fd),
					   take(&hsmfd),
					   NULL));

	if (!channel->owner) {
		log_broken(channel->log, "Could not subdaemon closing: %s",
			    strerror(errno));
		/* Disconnect it. */
		subd_send_msg(ld->connectd,
			      take(towire_connectd_discard_peer(NULL, &channel->peer->id,
								channel->peer->connectd_counter)));
		return;
	}

	/* FIXME: This is the old BOLT 2 text, which restricted the closing
	 * fee to cap at the final commitment fee.  We still do this for now.
	 *
	 * The sending node:
	 *  - MUST set `fee_satoshis` less than or equal to the base
	 *    fee of the final commitment transaction, as calculated in
	 *    [BOLT #3](03-transactions.md#fee-calculation).
	 */
	final_commit_feerate = get_feerate(channel->fee_states,
					   channel->opener, LOCAL);
	feelimit = commit_tx_base_fee(final_commit_feerate, 0,
				      option_anchor_outputs);

	/* If we can't determine feerate, start at half unilateral feerate. */
	feerate = mutual_close_feerate(ld->topology);