Trapping signal when sleep

[grzlus]

I found a problem, when try trap signal when process sleeps. This code works:

Signal.trap("HUP") { puts "Trapped" }
while(1) do
    # nothing, just looping
end

But when I try to sleep:

Signal.trap("HUP") { puts "Trapped with sleep" }
sleep 1234

I've got:

ERROR 6003 ,  (Break)
topaz 1> exit

After send signal to process. I tested this code on 1.9.3 (MRI) and it works, but on MagLev (I work with 1.1 version, but tested also 1.2a3) process terminates.