Re: [PATCH] gdbstub: Fix client Ctrl-C handling

[Nicholas Piggin]

On Tue Jul 11, 2023 at 6:59 PM AEST, Nicholas Piggin wrote:
> The gdb remote protocol has a special interrupt character (0x03) that is
> transmitted outside the regular packet processing, and represents a
> Ctrl-C pressed in the client. Despite not being a regular packet, it
> does expect a regular stop response if the stub successfully stops the
> running program.
>
> See: https://sourceware.org/gdb/onlinedocs/gdb/Interrupts.html
>
> Inhibiting the stop reply packet can lead to gdb client hang. So permit
> a stop response when receiving a character from gdb that stops the vm.
> Additionally, add a warning if that was not a 0x03 character, because
> the gdb session is likely to end up getting confused if this happens.
>
> Cc: qemu-stable@nongnu.org

Oh, I should note that this doesn't apply to any stable
branches I'm sorry. Will be more careful with the tag...

Thanks,
Nick