Exceptions and sockets

[Volker Stolz]

In local.glasgow-haskell-users, you wrote:
>I `Socket.accept' a connection and get a handle.
>Now, if the connections dies, but I still write to the handle,
>the whole thing crashes - without throwing an exception.
>(I checked that the RTS thinks  `hIsWritable h'
>even if `h' does no longer exist in reality.)

Looks to me like you're forgetting that the OS will give you a
sigPIPE on (semi-)closed sockets, which translates to a segfault
unless you install a signal handler:

 - http://www.haskell.org/ghc/docs/latest/set/socket.html#AEN13989
 - socket(2)
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