> My understanding is that System.Process avoids these problems by doing
> all the setup around forking a command in C code. I've banished
> forkProcess from my code base entirely, except for a double fork I need
> to daemonize, and I don't even trust that call. :/
I think you are right. forkProcess is necessary to deamonize a process
but I don't know other usage.
daemonize :: IO () -> IO ()
daemonize program = ensureDetachTerminalCanWork $ do
detachTerminal
ensureNeverAttachTerminal $ do
changeWorkingDirectory "/"
void $ setFileCreationMask 0
mapM_ closeFd [stdInput, stdOutput, stdError]
program
where
ensureDetachTerminalCanWork p = do
void $ forkProcess p
exitSuccess
ensureNeverAttachTerminal p = do
void $ forkProcess p
exitSuccess
detachTerminal = void createSession
--Kazu
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