Fix a number of issues with the process handling

runtime/bin/platform_macos.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/platform.h"
 
+#include <signal.h>
 #include <string.h>
 #include <unistd.h>
 
 
+bool Platform::Initialize() {
+  // Turn off the signal handler for SIGPIPE as it causes the process
+  // to terminate on writing to a closed pipe. Without the signal
+  // handler error EPIPE is set instead.
+  struct sigaction act;
+  bzero(&act, sizeof(act));
+  act.sa_handler = SIG_IGN;
+  if (sigaction(SIGPIPE, &act, 0) != 0) {
+    perror("Setting signal handler failed");
+    return false;
+  }
+  return true;
+}
+
+
 int Platform::NumberOfProcessors() {
   return sysconf(_SC_NPROCESSORS_ONLN);
 }
 
 
 const char* Platform::OperatingSystem() {
   return "macos";
 }
 
 
 char* Platform::StrError(int error_code) {
   static const int kBufferSize = 1024;
   char* error = static_cast<char*>(malloc(kBufferSize));
   error[0] = '\0';
   strerror_r(error_code, error, kBufferSize);
   return error;
 }