where event is one of:
startup exit abexit valgrindabexit all none
--track-fds=no|yes|all|bad track open file descriptors? [no]
- all includes reporting inherited file descriptors
+ all also reports on open inherited file
+ descriptors at exit (e.g. stdin/out/err)
+ bad only reports on file descriptor usage
+ errors and doesn't list open file descriptors
+ at exit
--modify-fds=no|yes|high modify newly open file descriptors? [no]
--time-stamp=no|yes add timestamps to log messages? [no]
--log-fd=<number> log messages to file descriptor [2=stderr]