Added code for renderer to cleanly exit.

content/renderer/renderer_main.cc

Index: content/renderer/renderer_main.cc
diff --git a/content/renderer/renderer_main.cc b/content/renderer/renderer_main.cc
index 306dee9aaf0ea6a511c53ae66884e431dc7abb29..6d8d2001871a7a3ccc4308a2a0d976f48c1fa577 100644
--- a/content/renderer/renderer_main.cc
+++ b/content/renderer/renderer_main.cc
@@ -126,6 +126,25 @@ class RendererMessageLoopObserver : public MessageLoop::TaskObserver {
   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
 };
 
+#if defined(RENDERER_SIGTERM_HANDLER)
+static void SigtermHandler(int signum)
+{

[Evan Martin, 2012/03/26 17:17:25]

curly should be on same line of function decl (see surrounding code)

+  LOG(INFO) << "SIGTERM caught by the renderer process. Calling exit().";

[Evan Martin, 2012/03/26 17:17:25]

I think LOG() probably does a bunch of stuff that isn't safe from a signal
handler.  You might want to just write() to the stderr fd.

+  exit(signum);
+}
+
+static void AddSigtermHandler()
+{
+  struct sigaction termAction;

[Evan Martin, 2012/03/26 17:17:25]

variable names should be like term_action

+  termAction.sa_handler = SigtermHandler;
+  sigfillset(&termAction.sa_mask);
+  termAction.sa_flags = 0;
+  LOG(INFO) << "Installing SIGTERM handler to the renderer process.";
+  sigaction(SIGTERM, &termAction, NULL);
+  LOG(INFO) << "Added SIGTERM handler to the renderer process.";

[Evan Martin, 2012/03/26 17:17:25]

Rather than this, perhaps you should just check the return value of sigaction? 
grep the code for use of the PLOG() macro to automatically strerror(errno).

+}
+#endif
+
 // mainline routine for running as the Renderer process
 int RendererMain(const content::MainFunctionParams& parameters) {
   TRACE_EVENT_BEGIN_ETW("RendererMain", 0, "");
@@ -232,6 +251,10 @@ int RendererMain(const content::MainFunctionParams& parameters) {
 
     startup_timer.Stop();  // End of Startup Time Measurement.
 
+#if defined(RENDERER_SIGTERM_HANDLER)
+    AddSigtermHandler();
+#endif
+
     if (run_loop) {
 #if defined(OS_MACOSX)
       if (pool)