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Sockets can be closed prematurely on threaded #396
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- changed the title
[-]Sockets can be closed prematurely[/-][+]Sockets can be closed prematurely on threaded[/+]on Apr 19, 2019 See also #397.
Reacted by Fumiaki KinoshitaA possible path would be
- remove the call to
mkWeakIORef - Merge Add withFdSocket #352
- Deprecate
fdSocket - Rewrite every use of
fdSocketwithwithFdSocket - Put
mkWeakIORefback - Remove
fdSocket
- remove the call to
In private communication with @fumieval, I understand that this is due to GC.
import Network.Socket main :: IO () main = do sock <- socket AF_INET Stream defaultProtocol setSocketOption sock ReuseAddr 1 bind sock $ SockAddrInet 6000 $ tupleToHostAddress (127, 0, 0, 1) listen sock 1 _ <- accept sock return ()
In this no loop example,
sockis to be GCed whileacceptis blocked.fdSocketis not the main cause of this problem. But the place wherefdSocketis used, this problem tends to appear. This proposal is to replace it with a safer API.Reacted by Evan Rutledge Borden#399 fixes this.
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7916e72 introduced a finaliser for a socket, but this may close the socket prematurely, resulting in Bad file descriptor error.
Reproducing example: tsurucapital@7496faa