SIGINT is not handled in forked process

If haskell program is forked in a toplevel hander that sends UserInterrupt in the main thread doesn't work, because Thread 1 doesn't exists in forked program, so that action is noop.

Minimal example:

import Control.Concurrent
import Control.Exception
import System.Posix

main = do
  pid <- forkProcess $ do
           handle (\UserInterrupt{} -> putStrLn "caught")
                  $ threadDelay 2000000
  signalProcess sigINT pid
  threadDelay 2000000

Expected result: "caught" printed to stdout. Actual result: nothing is printed.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	simonmar
Operating system
Architecture