Function peer_start_closingd

lightningd/closing_control.c:355–506

}

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;
	int hsmfd;
	struct lightningd *ld = channel->peer->ld;
	u32 final_commit_feerate;
	bool option_anchor_outputs = channel_has(channel, OPT_ANCHOR_OUTPUTS_DEPRECATED);
	bool option_anchors_zero_fee_htlc_tx = channel_has(channel, OPT_ANCHORS_ZERO_FEE_HTLC_TX);

	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_PERM_SIGN_CLOSING_TX
				  | HSM_PERM_COMMITMENT_POINT);
	if (hsmfd < 0) {
		log_broken(channel->log, "Could not get hsm fd for closing: %s",
			   strerror(errno));
		force_peer_disconnect(ld, channel->peer,
				      "Failed to get hsm fd for closingd");
		return;
	}

	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. */
		force_peer_disconnect(ld, channel->peer,
				      "Failed to create closingd");
		return;
	}

	/* BOLT #2:
	 * The sending node:
	 *   - SHOULD set the initial `fee_satoshis` according to its estimate of cost of
	 *   inclusion in a block.
	 *   - SHOULD set `fee_range` according to the minimum and maximum fees it is
	 *   prepared to pay for a close transaction.
	 */
	final_commit_feerate = get_feerate(channel->fee_states,
					   channel->opener, LOCAL);