chrome/browser/chrome_browser_main_extra_parts_x11.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/chrome_browser_main_extra_parts_x11.h"
   6
   7 #include "base/bind.h"
   8 #include "base/debug/debugger.h"
   9 #include "base/location.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/thread_task_runner_handle.h"
  12 #include "chrome/browser/lifetime/application_lifetime.h"
  13 #include "chrome/common/chrome_result_codes.h"
  14 #include "content/public/browser/browser_thread.h"
  15 #include "ui/base/x/x11_util.h"
  16 #include "ui/base/x/x11_util_internal.h"
  17
  18 using content::BrowserThread;
  19
  20 namespace {
  21
  22 // Indicates that we're currently responding to an IO error (by shutting down).
  23 bool g_in_x11_io_error_handler = false;
  24
  25 // Number of seconds to wait for UI thread to get an IO error if we get it on
  26 // the background thread.
  27 const int kWaitForUIThreadSeconds = 10;
  28
  29 int BrowserX11ErrorHandler(Display* d, XErrorEvent* error) {
  30   if (!g_in_x11_io_error_handler)
  31     base::ThreadTaskRunnerHandle::Get()->PostTask(
  32         FROM_HERE, base::Bind(&ui::LogErrorEventDescription, d, *error));
  33   return 0;
  34 }
  35
  36
  37 // This function is used to help us diagnose crash dumps that happen
  38 // during the shutdown process.
  39 NOINLINE void WaitingForUIThreadToHandleIOError() {
  40   // Ensure function isn't optimized away.
  41   asm("");
  42   sleep(kWaitForUIThreadSeconds);
  43 }
  44
  45 int BrowserX11IOErrorHandler(Display* d) {
  46   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
  47     // Wait for the UI thread (which has a different connection to the X server)
  48     // to get the error. We can't call shutdown from this thread without
  49     // tripping an error. Doing it through a function so that we'll be able
  50     // to see it in any crash dumps.
  51     WaitingForUIThreadToHandleIOError();
  52     return 0;
  53   }
  54   // If there's an IO error it likely means the X server has gone away
  55   if (!g_in_x11_io_error_handler) {
  56     g_in_x11_io_error_handler = true;
  57     LOG(ERROR) << "X IO error received (X server probably went away)";
  58     chrome::SessionEnding();
  59   }
  60
  61   return 0;
  62 }
  63
  64 int X11EmptyErrorHandler(Display* d, XErrorEvent* error) {
  65   return 0;
  66 }
  67
  68 int X11EmptyIOErrorHandler(Display* d) {
  69   return 0;
  70 }
  71
  72 }  // namespace
  73
  74 ChromeBrowserMainExtraPartsX11::ChromeBrowserMainExtraPartsX11() {
  75 }
  76
  77 ChromeBrowserMainExtraPartsX11::~ChromeBrowserMainExtraPartsX11() {
  78 }
  79
  80 void ChromeBrowserMainExtraPartsX11::PreEarlyInitialization() {
  81   // Installs the X11 error handlers for the browser process used during
  82   // startup. They simply print error messages and exit because
  83   // we can't shutdown properly while creating and initializing services.
  84   ui::SetX11ErrorHandlers(NULL, NULL);
  85 }
  86
  87 void ChromeBrowserMainExtraPartsX11::PostMainMessageLoopStart() {
  88   // Installs the X11 error handlers for the browser process after the
  89   // main message loop has started. This will allow us to exit cleanly
  90   // if X exits before us.
  91   ui::SetX11ErrorHandlers(BrowserX11ErrorHandler, BrowserX11IOErrorHandler);
  92 }
  93
  94 void ChromeBrowserMainExtraPartsX11::PostMainMessageLoopRun() {
  95   // Unset the X11 error handlers. The X11 error handlers log the errors using a
  96   // |PostTask()| on the message-loop. But since the message-loop is in the
  97   // process of terminating, this can cause errors.
  98   ui::SetX11ErrorHandlers(X11EmptyErrorHandler, X11EmptyIOErrorHandler);
  99 }