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Add socketToFd, a safe-ish Socket destruction method #68

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Add socketToFd, a safe-ish Socket destruction method #68

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9 changes: 9 additions & 0 deletions src/System/Socket.hsc
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,8 @@ module System.Socket (
-- * Operations
-- ** socket
, socket
-- ** socketToFd
, socketToFd
-- ** connect
, connect
-- ** bind
Expand Down Expand Up @@ -144,6 +146,7 @@ import GHC.Conc ( closeFdWith )

import Foreign.Storable
import Foreign.Marshal.Alloc
import System.Posix.Types (Fd (..))

import System.Socket.Unsafe

Expand Down Expand Up @@ -455,3 +458,9 @@ getAddress = getAddress'
when (i /= 0) (SocketException <$> peek errPtr >>= throwIO)
addr <- peek addrPtr
return addr

-- | Invalidate the given 'Socket' and return the file descriptor
-- it held. All calls on the socket will fail after this call.
-- Additionally, the file descriptor needs to be closed manually.
socketToFd :: Socket f t p -> IO Fd
socketToFd (Socket mfd) = Fd . fromIntegral <$> swapMVar mfd (-1)