This adds some plumbing for propagating the reason for a renderer's death

base/process_util_posix.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ skipping 219 matching lines @@
           break;
         }
         DPLOG(ERROR) << "Error waiting for process " << process_id;
       }
 
       usleep(sleep_ms * 1000);
       if (sleep_ms < kMaxSleepMs)
         sleep_ms *= 2;
     }
 
+    // If we're waiting and the child hasn't died by now, force it
+    // with a SIGKILL.
     if (!exited)
       result = kill(process_id, SIGKILL) == 0;
   }
 
   if (!result)
     DPLOG(ERROR) << "Unable to terminate process " << process_id;
 
   return result;
 }
 
@@ skipping 377 matching lines @@
   success &= (signal(SIGSYS, handler) != SIG_ERR);
 
   return success;
 }
 
 void RaiseProcessToHighPriority() {
   // On POSIX, we don't actually do anything here.  We could try to nice() or
   // setpriority() or sched_getscheduler, but these all require extra rights.
 }
 
-bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
-  int status;
+TerminationStatus GetTerminationStatus(ProcessHandle handle, int* exit_code) {
+  int status = 0;
   const pid_t result = HANDLE_EINTR(waitpid(handle, &status, WNOHANG));
   if (result == -1) {
     PLOG(ERROR) << "waitpid(" << handle << ")";
-    if (child_exited)
-      *child_exited = false;
-    return false;
+    if (exit_code)
+      *exit_code = 0;
+    return TERMINATION_STATUS_NORMAL_TERMINATION;
   } else if (result == 0) {
     // the child hasn't exited yet.
-    if (child_exited)
-      *child_exited = false;
-    return false;
+    if (exit_code)
+      *exit_code = 0;
+    return TERMINATION_STATUS_STILL_RUNNING;
   }
 
-  if (child_exited)
-    *child_exited = true;
+  if (exit_code)
+    *exit_code = status;
 
   if (WIFSIGNALED(status)) {
     switch (WTERMSIG(status)) {
+      case SIGABRT:
+      case SIGBUS:
+      case SIGFPE:
+      case SIGILL:
       case SIGSEGV:
-      case SIGILL:
-      case SIGABRT:
-      case SIGFPE:
-        return true;
+        return TERMINATION_STATUS_PROCESS_CRASHED;
+      case SIGINT:
+      case SIGKILL:
+      case SIGTERM:
+        return TERMINATION_STATUS_PROCESS_WAS_KILLED;
       default:
-        return false;
+        break;
     }
   }
 
-  if (WIFEXITED(status))
-    return WEXITSTATUS(status) != 0;
+  if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
+    return TERMINATION_STATUS_ABNORMAL_TERMINATION;
 
-  return false;
+  return TERMINATION_STATUS_NORMAL_TERMINATION;
 }
 
 bool WaitForExitCode(ProcessHandle handle, int* exit_code) {
   int status;
   if (HANDLE_EINTR(waitpid(handle, &status, 0)) == -1) {
     NOTREACHED();
     return false;
   }
 
   if (WIFEXITED(status)) {
@@ skipping 217 matching lines @@
                       const ProcessFilter* filter) {
   bool exited_cleanly =
       WaitForProcessesToExit(executable_name, wait_milliseconds,
                              filter);
   if (!exited_cleanly)
     KillProcesses(executable_name, exit_code, filter);
   return exited_cleanly;
 }
 
 }  // namespace base