#4449: GHC 7 can't do IO when demonized
------------------------------+---------------------------------------------
Reporter: kazu-yamamoto | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.1 | Keywords: forkProcess
Testcase: | Blockedby:
Os: MacOS X | Blocking:
Architecture: x86 | Failure: None/Unknown
------------------------------+---------------------------------------------
If a daemon is complied with GHC 7.1 with the -threaded option, the daemon
cannot do IO. The following code is a simple echo server which
demonstrates this bug:
{{{
import Control.Concurrent
import Network
import System.IO
import System.Posix.Daemonize
main :: IO ()
main = daemonize $ do
s <- listenOn (Service "7000")
loop s
return ()
loop :: Socket -> IO ThreadId
loop s = do
(hdr,_,_) <- accept s
forkIO $ echo hdr
loop s
echo :: Handle -> IO ()
echo hdr = do
str <- hGetLine hdr
hPutStrLn hdr str
hClose hdr
return ()
}}}
If "deamonize $" is removed, this program stays in your terminal and can
do IO.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4449>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
