If the outputs regarding Real-time event 34 (SIG34) disturb with debugging on Linux using gdb or ddd, one may configure the GDB to ignore these events:
handle SIG34 pass handle SIG34 noprint
The gdb will confirm it like this:
(gdb) handle SIG34 noprint Signal Stop Print Pass to program Description SIG34 No No Yes Real-time event 34
and the program flow not be interrupted anymore.
If you keep this settings you may add it into .gdbinit or another configuration file.
Linux signal timer
The Real-time event 34 is caused by the Linux signal timer that can be created by timer_create(). It is a timer that also interrupts select().