Broadcast a D-Bus message whenever a user-space process crash happens.

crash_reporter.cc

 // Copyright (c) 2010 The Chromium OS 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 <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "crash/system_logging.h"
@@ skipping 59 matching lines @@
 static void SignalCleanShutdown() {
   s_system_log.LogInfo("Clean shutdown signalled");
   file_util::Delete(FilePath(kUncleanShutdownFile), false);
 }
 
 static void CountUserCrash() {
   CHECK(IsMetricsCollectionAllowed());
   s_metrics_lib.SendEnumToUMA(std::string(kCrashCounterHistogram),
                               CRASH_KIND_USER,
                               CRASH_KIND_MAX);
+
+  // Announce through D-Bus whenever a user crash happens. This is
+  // used by the metrics daemon to log active use time between
+  // crashes.
+  //
+  // This could be done more efficiently by explicit fork/exec or
+  // using a dbus library directly. However, this should run
+  // relatively rarely and longer term we may need to implement a
+  // better way to do this that doesn't rely on D-Bus.
+  int status __attribute__((unused)) =
+      system("/usr/bin/dbus-send --type=signal --system / "
+             "org.chromium.CrashReporter.UserCrash");
 }
 
 int main(int argc, char *argv[]) {
   google::ParseCommandLineFlags(&argc, &argv, true);
   FilePath my_path(argv[0]);
   file_util::AbsolutePath(&my_path);
   s_metrics_lib.Init();
   s_system_log.Initialize(my_path.BaseName().value().c_str());
   UserCollector user_collector;
   user_collector.Initialize(CountUserCrash,
@@ skipping 28 matching lines @@
   // handling a crash.
   if (FLAGS_crash_test) {
     *(char *)0 = 0;
     return 0;
   }
 
   user_collector.HandleCrash(FLAGS_signal, FLAGS_pid, FLAGS_exec);
 
   return 0;
 }