Function std_session_send_df_header

libsigrok4DSL/std.c:76–104

* Standard API helper for sending an SR_DF_HEADER packet. * * This function can be used to simplify most driver's * hw_dev_acquisition_start() API callback. * * @param sdi The device instance to use. * @param prefix A driver-specific prefix string used for log messages. * Must not be NULL. An empty string is allowed. * * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or

 *         SR_ERR upon other errors.
 */
SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,
				       const char *prefix)
{
	int ret;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;

	if (!prefix) {
		sr_err("Invalid prefix.");
		return SR_ERR_ARG;
	}

	sr_dbg("%sStarting acquisition.", prefix);

	/* Send header packet to the session bus. */
	sr_dbg("%sSending SR_DF_HEADER packet.", prefix);
	packet.type = SR_DF_HEADER;
    packet.status = SR_PKT_OK;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);

	if ((ret = ds_data_forward(sdi, &packet)) < 0) {
		sr_err("%sFailed to send header packet: %d.", prefix, ret);
		return ret;
	}

	return SR_OK;
}

/*
 * Standard sr_session_stop() API helper.