This adds some plumbing for propagating the status and error code of a

renderer process that went away so that we can tell at the UI level
what happened to the tab: did it crash, or was it killed by the OOM
killer (or some other reason). This is in preparation for implementing
a new UI for when a process is killed by the OOM on ChromeOS which
handles it differently from a crash.

Most of the changes are modifications of the argument list to include
a status and error code for the exited process, but in addition the
following was done:

- Changed the name of DidProcessCrash to GetTerminationStatus.
- Added some new enum values to TerminationStatus enum (and named it)
in process_util.h, so it can be used as the status returned by
WhatHappenedToProcess.
- Improved process_util_unittest to actually test for crashing and
terminated processes on all platforms.
- Added a new notification for renderers that were killed.
- Added error code information to crash notification.
- Added status and error code information to renderer IPC message for
RenderViewGone.
- Added a UMA histogram count for number of renderer kills.

[This change was previously reviewed and LGTM'd:
http://codereview.chromium.org/3386014/show
but due to issues with "git cl push" was never committed to the tree.]

BUG=none
TEST=ran new unit test. Test passes on try servers.

Review URL: http://codereview.chromium.org/3869001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63067 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 24 insertions, 17 deletions

diff --git a/base/process_util_posix.cc b/base/process_util_posix.cc
index b1dbabd..c2242f1 100644
--- a/base/process_util_posix.cc
+++ b/base/process_util_posix.cc
@@ -193,6 +193,8 @@ bool KillProcess(ProcessHandle process_id, int exit_code, bool wait) {
         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;
   }
@@ -586,40 +588,45 @@ void RaiseProcessToHighPriority() {
   // 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 SIGSEGV:
-      case SIGILL:
       case SIGABRT:
+      case SIGBUS:
       case SIGFPE:
-        return true;
+      case SIGILL:
+      case SIGSEGV:
+        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) {