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   }
  34   return 0;
  35 }
  36
  37
  38 // This function is used to help us diagnose crash dumps that happen
  39 // during the shutdown process.
  40 NOINLINE void WaitingForUIThreadToHandleIOError() {
  41   // Ensure function isn't optimized away.
  42   asm("");
  43   sleep(kWaitForUIThreadSeconds);
  44 }
  45
  46 int BrowserX11IOErrorHandler(Display* d) {
  47   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
  48     // Wait for the UI thread (which has a different connection to the X server)
  49     // to get the error. We can't call shutdown from this thread without
  50     // tripping an error. Doing it through a function so that we'll be able
  51     // to see it in any crash dumps.
  52     WaitingForUIThreadToHandleIOError();
  53     return 0;
  54   }
  55
  56   // If there's an IO error it likely means the X server has gone away.
  57   // If this CHECK fails, then that means SessionEnding() below triggered some
  58   // code that tried to talk to the X server, resulting in yet another error.
  59   CHECK(!g_in_x11_io_error_handler);
  60
  61   g_in_x11_io_error_handler = true;
  62   LOG(ERROR) << "X IO error received (X server probably went away)";
  63   chrome::SessionEnding();
  64
  65   return 0;
  66 }
  67
  68 int X11EmptyErrorHandler(Display* d, XErrorEvent* error) {
  69   return 0;
  70 }
  71
  72 int X11EmptyIOErrorHandler(Display* d) {
  73   return 0;
  74 }
  75
  76 }  // namespace
  77
  78 ChromeBrowserMainExtraPartsX11::ChromeBrowserMainExtraPartsX11() {
  79 }
  80
  81 ChromeBrowserMainExtraPartsX11::~ChromeBrowserMainExtraPartsX11() {
  82 }
  83
  84 void ChromeBrowserMainExtraPartsX11::PreEarlyInitialization() {
  85   // Installs the X11 error handlers for the browser process used during
  86   // startup. They simply print error messages and exit because
  87   // we can't shutdown properly while creating and initializing services.
  88   ui::SetX11ErrorHandlers(NULL, NULL);
  89 }
  90
  91 void ChromeBrowserMainExtraPartsX11::PostMainMessageLoopStart() {
  92   // Installs the X11 error handlers for the browser process after the
  93   // main message loop has started. This will allow us to exit cleanly
  94   // if X exits before us.
  95   ui::SetX11ErrorHandlers(BrowserX11ErrorHandler, BrowserX11IOErrorHandler);
  96 }
  97
  98 void ChromeBrowserMainExtraPartsX11::PostMainMessageLoopRun() {
  99   // Unset the X11 error handlers. The X11 error handlers log the errors using a
 100   // |PostTask()| on the message-loop. But since the message-loop is in the
 101   // process of terminating, this can cause errors.
 102   ui::SetX11ErrorHandlers(X11EmptyErrorHandler, X11EmptyIOErrorHandler);
 103 }