Crash reporter: collect suspend and resume info from power manager

unclean_shutdown_collector.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 "crash-reporter/unclean_shutdown_collector.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "crash-reporter/system_logging.h"
 
 static const char kUncleanShutdownFile[] =
     "/var/lib/crash_reporter/pending_clean_shutdown";
 
+// Files created by power manager used for crash reporting.
+static const char kPowerdTracePath[] = "/var/lib/power_manager";
+// Presence of this file indicates that the system was suspended
+static const char kPowerdSuspended[] = "powerd_suspended";
+// Presence of this file indicates that the battery was critically low.
+static const char kPowerdLowBattery[] = "powerd_low_battery";
+
 UncleanShutdownCollector::UncleanShutdownCollector()
-    : unclean_shutdown_file_(kUncleanShutdownFile) {
+    : unclean_shutdown_file_(kUncleanShutdownFile),
+      powerd_trace_path_(kPowerdTracePath),
+      powerd_suspended_file_(powerd_trace_path_.Append(kPowerdSuspended)),
+      powerd_low_battery_file_(powerd_trace_path_.Append(kPowerdLowBattery)) {
 }
 
 UncleanShutdownCollector::~UncleanShutdownCollector() {
 }
 
 bool UncleanShutdownCollector::Enable() {
   FilePath file_path(unclean_shutdown_file_);
   file_util::CreateDirectory(file_path.DirName());
   if (file_util::WriteFile(file_path, "", 0) != 0) {
     logger_->LogError("Unable to create shutdown check file");
     return false;
   }
   return true;
 }
 
-bool UncleanShutdownCollector::DeleteUncleanShutdownFile() {
+bool UncleanShutdownCollector::DeleteUncleanShutdownFiles() {
   if (!file_util::Delete(FilePath(unclean_shutdown_file_), false)) {
     logger_->LogError("Failed to delete unclean shutdown file %s",
                       unclean_shutdown_file_);
     return false;
   }
+  // Delete power manager trace files if they exist.
+  file_util::Delete(powerd_suspended_file_, false);
+  file_util::Delete(powerd_low_battery_file_, false);
   return true;
 }
 
 bool UncleanShutdownCollector::Collect() {
   FilePath unclean_file_path(unclean_shutdown_file_);
   if (!file_util::PathExists(unclean_file_path)) {
     return false;
   }
   logger_->LogWarning("Last shutdown was not clean");
-  DeleteUncleanShutdownFile();
+  if (DeadBatteryCausedUncleanShutdown()) {
+    DeleteUncleanShutdownFiles();
+    return false;
+  }
+  DeleteUncleanShutdownFiles();
 
   if (is_feedback_allowed_function_()) {
     count_crash_function_();
   }
   return true;
 }
 
 bool UncleanShutdownCollector::Disable() {
   logger_->LogInfo("Clean shutdown signalled");
-  return DeleteUncleanShutdownFile();
+  return DeleteUncleanShutdownFiles();
 }
+
+bool UncleanShutdownCollector::DeadBatteryCausedUncleanShutdown()
+{
+  // Check for case of battery running out while suspended.
+  if (file_util::PathExists(powerd_suspended_file_)) {
+    logger_->LogInfo("Unclean shutdown occurred while suspended. Not counting "
+                     "toward unclean shutdown statistic.");
+    return true;
+  }
+  // Check for case of battery running out after resuming from a low-battery
+  // suspend.
+  if (file_util::PathExists(powerd_low_battery_file_)) {
+    logger_->LogInfo("Unclean shutdown occurred while running with battery "
+                     "critically low.  Not counting toward unclean shutdown "
+                     "statistic.");
+    return true;
+  }
+  return false;
+}