AuScanEvents - return the first event that satisfies the predicate

server    Specifies the connection to the audio server.

       mode      Specifies   how   far   to  look  for  a  match.   This  should  be  one  of  these  constants:
                 AuEventsQueuedAlready, AuEventsQueuedAfterReading, or AuEventsQueuedAfterFlush.

       dequeue   Specifies if a matching event is found, should it be removed from the queue.

       predicate Specifies the procedure that is called to determine if an event matches the criteria.

       arg       Specifies any additional arguments to be passed to the predicate procedure.

       event     Returns the matching event if found.

AuScanEvents scans the event queue looking  for  the  first  event  that  satisfies  the  caller-supplied
       predicate.   If  mode is AuEventsQueuedAlready, AuScanEvents only checks for events already in the queue.
       If mode  is  AuEventsQueuedAfterReading,  and  a  matching  event  isn't  found  already  in  the  queue,
       AuScanEvents   attempts   to  read  more  events  out  of  the  application's  connection.   If  mode  is
       AuEventsQueuedAfterFlush and a matching event isn't already in the queue or isn't  waiting  to  be  read,
       AuScanEvents  flushes  the  output  queue  and  attempts  to  read  more  events out of the application's
       connection.  If dequeue is AuTrue, and a matching event is found, it is  removed  from  the  queue.   The
       predicate  procedure  is  called  with  the  arguments server, event, and arg and should return AuTrue to
       indicate a match.

AuScanEvents - return the first event that satisfies the predicate

AuEventsQueued, AuScanForTypedEvent, AuNextEvent.

       audiolib - NetworkAudioSystem C Language Interface

audiolib - event handling                             1.9.4                                      AuScanEvents(3)

       #include <audio/audiolib.h>

       AuBoolAuScanEvents(server, mode, dequeue, predicate, arg, event)
           AuServer *server;
           int mode;
           AuBooldequeue;
           AuBool (*predicate)(AuServer *,AuEvent *, AuPointer);
           AuPointerarg;
           AuEvent *event; /* RETURN */