Hey I didn't notice that there is a ticket option on sourceforge and just create a merge request right away (https://sourceforge.net/p/ion-dtn/code/merge-requests/3/).
Anyway, as stated in the merge request:
The implementation of running() in bpsource has a bug that might prevent the application from closing. As I understand, the behaviour of running() should be that it remembers the last value passed to it and returns this value whenever called with NULL. To achieve that, <state> variable has to be declared as static to keep the value between function calls.</state>
Anonymous
