Fix a number of issues with the process handling

runtime/bin/platform_macos.cc

Index: runtime/bin/platform_macos.cc
diff --git a/runtime/bin/platform_macos.cc b/runtime/bin/platform_macos.cc
index 02745aa77b1cba756e11fe6686855e4586ebe24a..b2182496bcd3ba72b5967339bc5cc6c056f0fec5 100644
--- a/runtime/bin/platform_macos.cc
+++ b/runtime/bin/platform_macos.cc
@@ -4,10 +4,26 @@
 
 #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);
 }