> > > We have seen on several daq systems this problem: we start a run and observe that the number of 
> > > events written by mlogger to the output file is double the number of events actually collected. Upon 
> > > inspection of the output file, we see that every event is written twice. Restarting the run usually fixes 
> > > this problem.
> > 
> > mlogger.c fixed svn rev 4497. (from tr_start(), call tr_stop() if somehow it was not called already by end-run transition).
> 
> There is a new problem: after an unsuccessful run start, the next run start bombs with the error "output file runNNN.mid already exists". One way around this is to 
> manually remove the useless data file, another is to bump up the run number. Better solution is to automatically erase the output file created by unsuccessful run 
> starts.

Stefan suggested implementing a new transition, TR_STARTABORT, issued if TR_START fails. mlogger can use it to cleanup open files, etc, similar to TR_STOP.

This is now implemented. In mlogger, TR_STARTABORT is similar to TR_STOP, but deletes open output files and does not save end-of-run information into databases, etc. mfe.c does not handle this trnasition yet, but I 
plan to add it - to fix the observed situations where the run failed to start, but some equipment does not know about it and continues to generate events and send data.

svn rev 4514
K.O.