Revert "Signal handling."

runtime/bin/process_patch.dart

Index: runtime/bin/process_patch.dart
diff --git a/runtime/bin/process_patch.dart b/runtime/bin/process_patch.dart
index b83ec1b60114c10cee1aa3ef05972e036e39937d..e0e8fc6e237d21c632eb4158506f848ec3c7d11d 100644
--- a/runtime/bin/process_patch.dart
+++ b/runtime/bin/process_patch.dart
@@ -71,77 +71,12 @@ patch class Process {
 }
 
 
-List<_SignalController> _signalControllers = new List(32);
-
-
-class _SignalController {
-  final ProcessSignal signal;
-
-  StreamController _controller;
-  var _id;
-
-  _SignalController(this.signal) {
-    _controller = new StreamController.broadcast(
-        onListen: _listen,
-        onCancel: _cancel);
-  }
-
-  Stream<ProcessSignal> get stream => _controller.stream;
-
-  void _listen() {
-    var id = _setSignalHandler(signal._signalNumber);
-    if (id is! int) {
-      _controller.addError(
-          new SignalException("Failed to listen for $signal", id));
-      return;
-    }
-    _id = id;
-    var socket = new _RawSocket(new _NativeSocket.watch(id));
-    socket.listen((event) {
-      if (event == RawSocketEvent.READ) {
-        var bytes = socket.read();
-        for (int i = 0; i < bytes.length; i++) {
-          _controller.add(signal);
-        }
-      }
-    });
-  }
-
-  void _cancel() {
-    if (_id != null) {
-      _clearSignalHandler(signal._signalNumber);
-      _id = null;
-    }
-  }
-
-  /* patch */ static int _setSignalHandler(int signal)
-      native "Process_SetSignalHandler";
-  /* patch */ static int _clearSignalHandler(int signal)
-      native "Process_ClearSignalHandler";
-}
-
-
 patch class _ProcessUtils {
   /* patch */ static void _exit(int status) native "Process_Exit";
   /* patch */ static void _setExitCode(int status)
       native "Process_SetExitCode";
   /* patch */ static void _sleep(int millis) native "Process_Sleep";
   /* patch */ static int _pid(Process process) native "Process_Pid";
-  /* patch */ static Stream<ProcessSignal> _watchSignal(ProcessSignal signal) {
-    if (signal != ProcessSignal.SIGHUP &&
-        signal != ProcessSignal.SIGINT &&
-        (Platform.isWindows ||
-         (signal != ProcessSignal.SIGUSR1 &&
-          signal != ProcessSignal.SIGUSR2 &&
-          signal != ProcessSignal.SIGWINCH))) {
-      throw new SignalException(
-          "Listening for signal $signal is not supported");
-    }
-    if (_signalControllers[signal._signalNumber] == null) {
-      _signalControllers[signal._signalNumber] = new _SignalController(signal);
-    }
-    return _signalControllers[signal._signalNumber].stream;
-  }
 }