*
* @iter: trace collection iterator (input)
* @stream: stream containing event at current position (output)
* @event: current event (output)
* Return 0 on success, negative error value on error.
*/
*
* @iter: trace collection iterator (input)
* @stream: stream containing event at current position (output)
* @event: current event (output)
* Return 0 on success, negative error value on error.
*/