SCP: Ctrl-C/Ctrl-F does not work as intended for debugger

[al20878]

• Context

I definitely remember that it used to work at some time in the past. When the simulator (I use PDP11) is built with "DEBUG=1", started under "gdb", and then let run (with the "r" command), <Ctrl/C> was delivered to the software running under the simulator, and <Ctrl/F> would stop simh and get the gdb prompt.

Running it today, <Ctrl/C> gets delivered as SIGINT, causing the gdb prompt outright. OTOH, <Ctrl/F> also seems to deliver SIGINT, and get the gdb prompt, BUT here's the difference:

using the "continue" (c) command in gdb, continues the simulation in the first case; and in the second case, simh bails out to the sim> prompt (as if <Ctrl/E> was pressed). And there seems to be no way for the simulated software to get to read <Ctrl/C>.

Something has changed in the behavior. I wonder could it be caused by the readline drop-in replacement?

• how you built the simulator or that you're using prebuilt binaries

make DEBUG=1 pdp11

• the expected behavior and the actual behavior

I suppose it should work as it states:

sim> b rl
%SIM-INFO: SIGINT will be delivered to your debugger when the ^F character is entered