Revert "Signal handling."

sdk/lib/io/process.dart

Index: sdk/lib/io/process.dart
diff --git a/sdk/lib/io/process.dart b/sdk/lib/io/process.dart
index 3b340c3a8a0d308732cb0e2632cfdff50eb23c38..3c0f0fe392a3b74891afa4d2b6eb4fe680c3548e 100644
--- a/sdk/lib/io/process.dart
+++ b/sdk/lib/io/process.dart
@@ -11,7 +11,6 @@ class _ProcessUtils {
   external static void _setExitCode(int status);
   external static void _sleep(int millis);
   external static int _pid(Process process);
-  external static Stream<ProcessSignal> _watchSignal(ProcessSignal signal);
 }
 
 /**
@@ -311,60 +310,37 @@ abstract class ProcessResult {
  * to a child process, see [:Process.kill:].
  */
 class ProcessSignal {
-  static const ProcessSignal SIGHUP = const ProcessSignal._(1, "SIGHUP");
-  static const ProcessSignal SIGINT = const ProcessSignal._(2, "SIGINT");
-  static const ProcessSignal SIGQUIT = const ProcessSignal._(3, "SIGQUIT");
-  static const ProcessSignal SIGILL = const ProcessSignal._(4, "SIGILL");
-  static const ProcessSignal SIGTRAP = const ProcessSignal._(5, "SIGTRAP");
-  static const ProcessSignal SIGABRT = const ProcessSignal._(6, "SIGABRT");
-  static const ProcessSignal SIGBUS = const ProcessSignal._(7, "SIGBUS");
-  static const ProcessSignal SIGFPE = const ProcessSignal._(8, "SIGFPE");
-  static const ProcessSignal SIGKILL = const ProcessSignal._(9, "SIGKILL");
-  static const ProcessSignal SIGUSR1 = const ProcessSignal._(10, "SIGUSR1");
-  static const ProcessSignal SIGSEGV = const ProcessSignal._(11, "SIGSEGV");
-  static const ProcessSignal SIGUSR2 = const ProcessSignal._(12, "SIGUSR2");
-  static const ProcessSignal SIGPIPE = const ProcessSignal._(13, "SIGPIPE");
-  static const ProcessSignal SIGALRM = const ProcessSignal._(14, "SIGALRM");
-  static const ProcessSignal SIGTERM = const ProcessSignal._(15, "SIGTERM");
-  static const ProcessSignal SIGCHLD = const ProcessSignal._(17, "SIGCHLD");
-  static const ProcessSignal SIGCONT = const ProcessSignal._(18, "SIGCONT");
-  static const ProcessSignal SIGSTOP = const ProcessSignal._(19, "SIGSTOP");
-  static const ProcessSignal SIGTSTP = const ProcessSignal._(20, "SIGTSTP");
-  static const ProcessSignal SIGTTIN = const ProcessSignal._(21, "SIGTTIN");
-  static const ProcessSignal SIGTTOU = const ProcessSignal._(22, "SIGTTOU");
-  static const ProcessSignal SIGURG = const ProcessSignal._(23, "SIGURG");
-  static const ProcessSignal SIGXCPU = const ProcessSignal._(24, "SIGXCPU");
-  static const ProcessSignal SIGXFSZ = const ProcessSignal._(25, "SIGXFSZ");
-  static const ProcessSignal SIGVTALRM = const ProcessSignal._(26, "SIGVTALRM");
-  static const ProcessSignal SIGPROF = const ProcessSignal._(27, "SIGPROF");
-  static const ProcessSignal SIGWINCH = const ProcessSignal._(28, "SIGWINCH");
-  static const ProcessSignal SIGPOLL = const ProcessSignal._(29, "SIGPOLL");
-  static const ProcessSignal SIGSYS = const ProcessSignal._(31, "SIGSYS");
-
+  static const ProcessSignal SIGHUP = const ProcessSignal._signal(1);
+  static const ProcessSignal SIGINT = const ProcessSignal._signal(2);
+  static const ProcessSignal SIGQUIT = const ProcessSignal._signal(3);
+  static const ProcessSignal SIGILL = const ProcessSignal._signal(4);
+  static const ProcessSignal SIGTRAP = const ProcessSignal._signal(5);
+  static const ProcessSignal SIGABRT = const ProcessSignal._signal(6);
+  static const ProcessSignal SIGBUS = const ProcessSignal._signal(7);
+  static const ProcessSignal SIGFPE = const ProcessSignal._signal(8);
+  static const ProcessSignal SIGKILL = const ProcessSignal._signal(9);
+  static const ProcessSignal SIGUSR1 = const ProcessSignal._signal(10);
+  static const ProcessSignal SIGSEGV = const ProcessSignal._signal(11);
+  static const ProcessSignal SIGUSR2 = const ProcessSignal._signal(12);
+  static const ProcessSignal SIGPIPE = const ProcessSignal._signal(13);
+  static const ProcessSignal SIGALRM = const ProcessSignal._signal(14);
+  static const ProcessSignal SIGTERM = const ProcessSignal._signal(15);
+  static const ProcessSignal SIGCHLD = const ProcessSignal._signal(17);
+  static const ProcessSignal SIGCONT = const ProcessSignal._signal(18);
+  static const ProcessSignal SIGSTOP = const ProcessSignal._signal(19);
+  static const ProcessSignal SIGTSTP = const ProcessSignal._signal(20);
+  static const ProcessSignal SIGTTIN = const ProcessSignal._signal(21);
+  static const ProcessSignal SIGTTOU = const ProcessSignal._signal(22);
+  static const ProcessSignal SIGURG = const ProcessSignal._signal(23);
+  static const ProcessSignal SIGXCPU = const ProcessSignal._signal(24);
+  static const ProcessSignal SIGXFSZ = const ProcessSignal._signal(25);
+  static const ProcessSignal SIGVTALRM = const ProcessSignal._signal(26);
+  static const ProcessSignal SIGPROF = const ProcessSignal._signal(27);
+  static const ProcessSignal SIGPOLL = const ProcessSignal._signal(29);
+  static const ProcessSignal SIGSYS = const ProcessSignal._signal(31);
+
+  const ProcessSignal._signal(int this._signalNumber);
   final int _signalNumber;
-  final String _name;
-
-  const ProcessSignal._(this._signalNumber, this._name);
-
-  String toString() => _name;
-
-  Stream<ProcessSignal> watch() => _ProcessUtils._watchSignal(this);
-}
-
-
-class SignalException implements IOException {
-  final String message;
-  final osError;
-
-  const SignalException(String this.message, [this.osError = null]);
-
-  String toString() {
-    var msg = "";
-    if (osError != null) {
-      msg = ", osError: $osError";
-    }
-    return "SignalException: $message$msg";
-  }
 }