diff --git a/System/Process.hs b/System/Process.hs
--- a/System/Process.hs
+++ b/System/Process.hs
@@ -43,6 +43,7 @@
     readCreateProcessWithExitCode,
     readProcessWithExitCode,
     withCreateProcess,
+    cleanupProcess,
 
     -- ** Related utilities
     showCommandForUser,
@@ -245,7 +246,12 @@
     C.bracketOnError (createProcess_ fun c) cleanupProcess
                      (\(m_in, m_out, m_err, ph) -> action m_in m_out m_err ph)
 
-
+-- | Cleans up the process.
+-- 
+-- This function is meant to be invoked from any application level cleanup 
+-- handler. It terminates the process, and closes any 'CreatePipe' 'handle's.
+-- 
+-- @since 1.6.4.0
 cleanupProcess :: (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle)
                -> IO ()
 cleanupProcess (mb_stdin, mb_stdout, mb_stderr,
@@ -728,8 +734,10 @@
 -- has indeed terminated, use 'getProcessExitCode'.
 --
 -- On Unix systems, 'terminateProcess' sends the process the SIGTERM signal.
--- On Windows systems, the Win32 @TerminateProcess@ function is called, passing
--- an exit code of 1.
+-- On Windows systems, if `use_process_jobs` is `True` then the Win32 @TerminateJobObject@
+-- function is called to kill all processes associated with the job and passing the
+-- exit code of 1 to each of them. Otherwise if `use_process_jobs` is `False` then the
+-- Win32 @TerminateProcess@ function is called, passing an exit code of 1.
 --
 -- Note: on Windows, if the process was a shell command created by
 -- 'createProcess' with 'shell', or created by 'runCommand' or
diff --git a/System/Process/Common.hs b/System/Process/Common.hs
--- a/System/Process/Common.hs
+++ b/System/Process/Common.hs
@@ -44,7 +44,7 @@
 import GHC.IO.Handle.Types hiding (ClosedHandle)
 import System.IO.Error
 import Data.Typeable
-import GHC.IO.IOMode
+import System.IO (IOMode)
 
 -- We do a minimal amount of CPP here to provide uniform data types across
 -- Windows and POSIX.
diff --git a/System/Process/Windows.hsc b/System/Process/Windows.hsc
--- a/System/Process/Windows.hsc
+++ b/System/Process/Windows.hsc
@@ -34,7 +34,7 @@
 import GHC.IO.Handle.FD
 import GHC.IO.Handle.Types hiding (ClosedHandle)
 import System.IO.Error
-import GHC.IO.IOMode
+import System.IO (IOMode(..))
 
 import System.Directory         ( doesFileExist )
 import System.Environment       ( getEnv )
@@ -208,7 +208,7 @@
                  then Just <$> peek p_exitCode
                  else return Nothing
 
-insertItem :: Eq k => MVar [(k, v)] -> k -> v -> IO ()
+insertItem :: MVar [(k, v)] -> k -> v -> IO ()
 insertItem env_ k v = modifyMVar_ env_ (return . ((k, v):))
 
 getItem :: Eq k => MVar [(k, v)] -> k -> IO v
diff --git a/cbits/runProcess.c b/cbits/runProcess.c
--- a/cbits/runProcess.c
+++ b/cbits/runProcess.c
@@ -111,6 +111,18 @@
     r = pipe(forkCommunicationFds);
     if (r == -1) {
         *failed_doing = "runInteractiveProcess: pipe";
+        if (fdStdIn == -1) {
+            close(fdStdInput[0]);
+            close(fdStdInput[1]);
+        }
+        if (fdStdOut == -1) {
+            close(fdStdOutput[0]);
+            close(fdStdOutput[1]);
+        }
+        if (fdStdErr == -1) {
+            close(fdStdError[0]);
+            close(fdStdError[1]);
+        }
         return -1;
     }
 
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,13 @@
 # Changelog for [`process` package](http://hackage.haskell.org/package/process)
 
+## 1.6.4.0 *July 2018*
+
+* Bug fix: Don't leak pipes on failure
+  [#122](https://github.com/haskell/process/issues/122)
+* Expose `cleanupProcess` from `System.Process` 
+  [#130](https://github.com/haskell/process/pull/130)
+* Drop support for GHC before 7.10.3
+
 ## 1.6.3.0 *January 2018*
 
 * Added `getPid` and export of platform specific `Pid` type
diff --git a/process.cabal b/process.cabal
--- a/process.cabal
+++ b/process.cabal
@@ -1,5 +1,5 @@
 name:          process
-version:       1.6.3.0
+version:       1.6.4.0
 -- NOTE: Don't forget to update ./changelog.md
 license:       BSD3
 license-file:  LICENSE
@@ -46,8 +46,7 @@
         InterruptibleFFI
         RecordWildCards
         Trustworthy
-    if impl(ghc>=7.9)
-        other-extensions: Safe
+        Safe
 
     exposed-modules:
         System.Cmd
@@ -61,7 +60,7 @@
         cpp-options: -DWINDOWS
     else
         other-modules: System.Process.Posix
-        build-depends: unix >= 2.5 && < 2.8
+        build-depends: unix >= 2.5 && < 2.9
 
     c-sources:
         cbits/runProcess.c
@@ -74,7 +73,7 @@
 
     ghc-options: -Wall
 
-    build-depends: base      >= 4.4 && < 4.12,
+    build-depends: base      >= 4.8.2 && < 4.13,
                    directory >= 1.1 && < 1.4,
                    filepath  >= 1.2 && < 1.5,
                    deepseq   >= 1.1 && < 1.5
@@ -84,7 +83,9 @@
   hs-source-dirs: test
   main-is: main.hs
   type: exitcode-stdio-1.0
-  build-depends: base
+  -- Add otherwise redundant bounds on base since GHC's build system runs
+  -- `cabal check`, which mandates bounds on base.
+  build-depends: base >= 4 && < 5
                , bytestring
                , directory
                , process