[Haskell-cafe] Why is GHCi so hard to kill?

[Ruben Astudillo]

On 18/05/17 03:09, Jeremy Henty wrote:
> Is  there a  reason for  ghci being  so unkillable?   It is  generally
> considered a bad idea for a program to ignore the TERM signal.

it has to do with passing the exception to the program running
inside ghci. Your example didn't manifest it because it was pure
functions

    ghci> (last $ repeat ()) :: ()

and those don't catch exceptions. Yet if you put

    ghci> import Control.Monad (forever)
    ghci> forever (putStrLn "howdy")

it will print forever until you press C-c on your terminal, as IO
actions can react to exceptions and have a default handler for C-c.

SIGKILL acted inmediatly because it isn't really a signal, the kernel
just kills the process.

-- 
-- Ruben

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