return SR_OK;
}
+
+/**
+ * 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.payload = (uint8_t *)&header;
+ header.feed_version = 1;
+ gettimeofday(&header.starttime, NULL);
+
+ if ((ret = sr_session_send(sdi, &packet)) < 0) {
+ sr_err("%sFailed to send header packet: %d.", prefix, ret);
+ return ret;
+ }
+
+ return SR_OK;
+}