Ignore 'permisision denied' error cleaning up processes

[lsp-test.git] / src / Language / Haskell / LSP / Test / Compat.hs

diff --git a/src/Language/Haskell/LSP/Test/Compat.hs b/src/Language/Haskell/LSP/Test/Compat.hs
index e9b2c4c8f2fd7e645b9bf08f5bd0ac4c2bd46e98..a6151949a07d7486db2069662cba52c112038dd9 100644 (file)
--- a/src/Language/Haskell/LSP/Test/Compat.hs
+++ b/src/Language/Haskell/LSP/Test/Compat.hs
@@ -5,30 +5,115 @@
 {-# OPTIONS_GHC -Wunused-imports #-}
 module Language.Haskell.LSP.Test.Compat where
 
-import Control.Concurrent.Chan
-import Control.Monad.IO.Class
-import Data.Conduit
+import Data.Maybe
+import System.IO
 
-#ifdef mingw32_HOST_OS
+#if MIN_VERSION_process(1,6,3)
+-- We have to hide cleanupProcess for process-1.6.3.0
+-- cause it is in the public api for 1.6.3.0 versions
+-- shipped with ghc >= 8.6 and < 8.6.4
+import System.Process hiding (getPid, cleanupProcess, withCreateProcess)
+# if MIN_VERSION_process(1,6,4)
+import qualified System.Process (getPid, cleanupProcess, withCreateProcess)
+# else
+import Foreign.C.Error
+import GHC.IO.Exception ( IOErrorType(..), IOException(..) )
+
+import qualified System.Process (getPid)
+import qualified Control.Exception as C
+# endif
+#else
+import Control.Concurrent.MVar
+import Foreign.C.Error
+import GHC.IO.Exception ( IOErrorType(..), IOException(..) )
+import System.Process hiding (withCreateProcess)
+import System.Process.Internals
 
-import qualified System.Win32.Process as P (getCurrentProcessId)
-getProcessID :: IO Int
-getProcessID = fromIntegral <$> P.getCurrentProcessId
+import qualified Control.Exception as C
+#endif
 
+#ifdef mingw32_HOST_OS
+import qualified System.Win32.Process
 #else
+import qualified System.Posix.Process
+#endif
 
-import qualified System.Posix.Process as P (getProcessID)
-getProcessID :: IO Int
-getProcessID = fromIntegral <$> P.getProcessID
 
+getCurrentProcessID :: IO Int
+#ifdef mingw32_HOST_OS
+getCurrentProcessID = fromIntegral <$> System.Win32.Process.getCurrentProcessId
+#else
+getCurrentProcessID = fromIntegral <$> System.Posix.Process.getProcessID
 #endif
 
-#if MIN_VERSION_conduit(1,3,0)
-chanSource :: MonadIO m => Chan o -> ConduitT i o m b
+getProcessID :: ProcessHandle -> IO Int
+getProcessID p = fromIntegral . fromJust <$> getProcessID' p
+  where
+#if MIN_VERSION_process(1,6,3)
+  getProcessID' = System.Process.getPid
 #else
-chanSource :: MonadIO m => Chan o -> ConduitM i o m b
+#if MIN_VERSION_process(1,6,0)
+  getProcessID' (ProcessHandle mh _ _) = do
+#else
+  getProcessID' (ProcessHandle mh _) = do
+#endif
+    p_ <- readMVar mh
+    case p_ of
+#ifdef mingw32_HOST_OS
+      OpenHandle h -> do
+        pid <- System.Win32.Process.getProcessId h
+        return $ Just pid
+#else
+      OpenHandle pid -> return $ Just pid
+#endif
+      _ -> return Nothing
+#endif
+
+cleanupRunningProcess :: (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> IO ()
+cleanupRunningProcess p@(_, _, _, ph) =
+  getProcessExitCode ph >>= maybe (cleanupProcess p) (const $ return ())
+
+cleanupProcess
+  :: (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) -> IO ()
+
+withCreateProcess
+  :: CreateProcess
+  -> (Maybe Handle -> Maybe Handle -> Maybe Handle -> ProcessHandle -> IO a)
+  -> IO a
+
+#if MIN_VERSION_process(1,6,4)
+
+cleanupProcess = System.Process.cleanupProcess
+
+withCreateProcess = System.Process.withCreateProcess
+
+#else
+
+cleanupProcess (mb_stdin, mb_stdout, mb_stderr, ph) = do
+    -- We ignore the spurious "permission denied" error in windows:
+    --   see https://github.com/haskell/process/issues/110
+    ignorePermDenied $ terminateProcess ph
+    -- Note, it's important that other threads that might be reading/writing
+    -- these handles also get killed off, since otherwise they might be holding
+    -- the handle lock and prevent us from closing, leading to deadlock.
+    maybe (return ()) (ignoreSigPipe . hClose) mb_stdin
+    maybe (return ()) hClose mb_stdout
+    maybe (return ()) hClose mb_stderr
+
+    return ()
+  where ignoreSigPipe = ignoreIOError ResourceVanished ePIPE
+        ignorePermDenied = ignoreIOError PermissionDenied ePERM
+    
+ignoreIOError :: IOErrorType -> Errno -> IO () -> IO ()
+ignoreIOError ioErrorType errno =
+  C.handle $ \e -> case e of
+                     IOError { ioe_type  = iot
+                             , ioe_errno = Just ioe }
+                       | iot == ioErrorType && Errno ioe == errno -> return ()
+                     _ -> C.throwIO e
+
+withCreateProcess c action =
+  C.bracket (createProcess c) cleanupProcess
+            (\(m_in, m_out, m_err, ph) -> action m_in m_out m_err ph)
+
 #endif
-chanSource c = do
-  x <- liftIO $ readChan c
-  yield x
-  chanSource c