[Haskell-cafe] Why is GHCi so hard to kill?
ruben.astud at gmail.com
Thu May 18 08:02:02 UTC 2017
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
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.
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