diff --git a/System/Posix/Pty.hs b/System/Posix/Pty.hs
--- a/System/Posix/Pty.hs
+++ b/System/Posix/Pty.hs
@@ -54,6 +54,7 @@
 import Control.Applicative
 #endif
 
+import Control.Concurrent (withMVar)
 import Control.Exception (bracket, throwIO, ErrorCall(..))
 import Control.Monad (when)
 
@@ -74,7 +75,7 @@
 import System.IO.Error (mkIOError, eofErrorType)
 import System.Posix.IO (fdReadBuf, fdWriteBuf,closeFd)
 import System.Posix.Types
-import System.Process.Internals (mkProcessHandle, ProcessHandle)
+import System.Process.Internals (mkProcessHandle, runInteractiveProcess_lock, ProcessHandle)
 
 import qualified System.Posix.Terminal as T
 import System.Posix.Terminal hiding
@@ -225,7 +226,8 @@
         bracket allocLists cleanupLists $ \(argv, env) -> do
             alloca $ \pidPtr -> do
                 fd <- throwErrnoIfMinus1Retry "failed to fork or open pty" $
-                        fork_exec_with_pty x y search path argv env pidPtr
+                        withMVar runInteractiveProcess_lock $ \_ ->
+                          fork_exec_with_pty x y search path argv env pidPtr
 
                 pid <- peek pidPtr
                 handle <- mkProcessHandle (fromIntegral pid) True
diff --git a/cbits/fork_exec_with_pty.c b/cbits/fork_exec_with_pty.c
--- a/cbits/fork_exec_with_pty.c
+++ b/cbits/fork_exec_with_pty.c
@@ -13,14 +13,20 @@
 
 #if defined(__APPLE__)
 #include <util.h>
-#elif defined(__linux__)
+#elif defined(__GLIBC__)
 #include <pty.h>
-#else /* bsd */
+#else /* bsd without glibc */
 #include <libutil.h>
 #endif
 
 #include <HsFFI.h>
 
+#include "Rts.h"
+
+// Rts internal API, not exposed in a public header file
+extern void blockUserSignals(void);
+extern void unblockUserSignals(void);
+
 #include "fork_exec_with_pty.h"
 
 /* Should be exported by unistd.h, but isn't on OSX. */
@@ -48,11 +54,23 @@
     ws.ws_row = sy;
 
     /* Fork and exec, returning the master pty. */
+    blockUserSignals();
+    stopTimer();
+
     *child_pid = forkpty(&pty, NULL, NULL, &ws);
+
+    int ret = pty;
+
     switch (*child_pid) {
     case -1:
+        unblockUserSignals();
+        startTimer();
+
         return -1;
     case 0:
+        /* Child process */
+        unblockUserSignals();
+
         /* If an environment is specified, override the old one. */
         if (env) environ = (char**) env;
 
@@ -63,10 +81,15 @@
         perror("exec failed");
         exit(EXIT_FAILURE);
     default:
+        /* Parent process */
+
         /* Switch the pty to packet mode, we'll deal with packeting on the
            haskell side of things. */
-        if (ioctl(pty, TIOCPKT, &packet_mode) == -1) return 1;
+        if (ioctl(pty, TIOCPKT, &packet_mode) == -1) ret = 1;
 
-        return pty;
+        unblockUserSignals();
+        startTimer();
+
+        return ret;
     }
 }
diff --git a/posix-pty.cabal b/posix-pty.cabal
--- a/posix-pty.cabal
+++ b/posix-pty.cabal
@@ -1,12 +1,12 @@
 Name:                posix-pty
-Version:             0.2.1.1
+Version:             0.2.2
 
 Homepage:            https://bitbucket.org/merijnv/posix-pty
 Bug-Reports:         https://github.com/merijn/posix-pty/issues
 
 Author:              Merijn Verstraaten
 Maintainer:          Merijn Verstraaten <merijn@inconsistent.nl>
-Copyright:           Copyright © 2013-2015 Merijn Verstraaten,
+Copyright:           Copyright © 2013-2020 Merijn Verstraaten,
                      Copyright © 2014 Vladimir Kirillov
 
 License:             BSD3
@@ -28,18 +28,17 @@
 Library
   Default-Language:     Haskell2010
   GHC-Options:          -Wall
-  GHC-Prof-Options:     -auto-all -caf-all
   Exposed-Modules:      System.Posix.Pty
   Other-Modules:        
 
   C-Sources:            cbits/fork_exec_with_pty.c cbits/pty_size.c
-  CC-Options:           -Wall -Wextra -pedantic -std=c99
+  CC-Options:           -Wall -Wextra -std=c99
   Include-Dirs:         cbits
   Includes:             fork_exec_with_pty.h pty_size.h
 
   Build-Depends:        base >= 4 && < 5
                ,        bytestring >= 0.10
-               ,        process >= 1.2
+               ,        process >= 1.6.6.0
                ,        unix >= 2.6
 
   if os(linux) || os(freebsd)
@@ -59,11 +58,3 @@
 Source-Repository head
   Type:     git
   Location: ssh://github.com:merijn/posix-pty.git
-
-Source-Repository head
-  Type:     mercurial
-  Location: git+ssh://github.com:merijn/posix-pty.git
-
-Source-Repository head
-  Type:     mercurial
-  Location: https://bitbucket.org/merijnv/posix-pty