Re: Trapping Control-C in an interactive Lua program

[Richard Hundt <richardhundt@...>]

Hi Steve,

steve donovan wrote:
> Hi all,
>
> This is ultimately not a Lua-specific problem, but here we go:
> sometimes you need an interactive Lua program that doesn't quietly die
> on control-C.
>
> I've tried using SetConsoleCtrlHandler(nil,1) and
> signal(SIGINT,SIG_IGN) using Alien, and no go.
>
> Obviously I could change lua.c to get the behaviour I need, but
> naturally I would prefer not to.
>
> steve d.

With luasys [1] it'd look like this (taken verbatim from the included 
tests):

print"-- Signal: wait SIGINT"
do
    local function on_signal(evq, evid, _, _, _, timeout)
        if timeout then
            assert(evq:timeout(evid))
            assert(evq:ignore_signal("INT", false))
            print"SIGINT enabled. Please, press Ctrl-C..."
        else
            print"Thanks!"
        end
    end

    local evq = assert(sys.event_queue())

    assert(evq:add_signal("INT", on_signal, 3000, true))
    assert(evq:ignore_signal("INT", true))

    evq:loop(10000)
    print"OK"
end

Dunno what your feelings are on using luasys, but just thought I'd add 
it into the mix.

Cheers,
Rich

[1] http://luaforge.net/projects/luasys/