LCOV - code coverage report
Current view: directory - toolkit/xre - nsX11ErrorHandler.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 55 0 0.0 %
Date: 2012-06-02 Functions: 2 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * the Mozilla Foundation <http://www.mozilla.org/>
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Karl Tomlinson <karlt+@karlt.net>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : #include "nsX11ErrorHandler.h"
      40                 : 
      41                 : #include "prenv.h"
      42                 : #include "nsXULAppAPI.h"
      43                 : #include "nsExceptionHandler.h"
      44                 : #include "nsDebug.h"
      45                 : 
      46                 : #include "mozilla/X11Util.h"
      47                 : #include <X11/Xlib.h>
      48                 : 
      49                 : #define BUFSIZE 2048 // What Xlib uses with XGetErrorDatabaseText
      50                 : 
      51                 : extern "C" {
      52                 : static int
      53               0 : X11Error(Display *display, XErrorEvent *event) {
      54                 :   // Get an indication of how long ago the request that caused the error was
      55                 :   // made.
      56               0 :   unsigned long age = NextRequest(display) - event->serial;
      57                 : 
      58                 :   // Get a string to represent the request that caused the error.
      59               0 :   nsCAutoString message;
      60               0 :   if (event->request_code < 128) {
      61                 :     // Core protocol request
      62               0 :     message.AppendInt(event->request_code);
      63                 :   } else {
      64                 :     // Extension request
      65                 : 
      66                 :     // man XSetErrorHandler says "the error handler should not call any
      67                 :     // functions (directly or indirectly) on the display that will generate
      68                 :     // protocol requests or that will look for input events" so we use another
      69                 :     // temporary Display to request extension information.  This assumes on
      70                 :     // the DISPLAY environment variable has been set and matches what was used
      71                 :     // to open |display|.
      72               0 :     Display *tmpDisplay = XOpenDisplay(NULL);
      73               0 :     if (tmpDisplay) {
      74                 :       int nExts;
      75               0 :       char** extNames = XListExtensions(tmpDisplay, &nExts);
      76                 :       int first_error;
      77               0 :       if (extNames) {
      78               0 :         for (int i = 0; i < nExts; ++i) {
      79                 :           int major_opcode, first_event;
      80               0 :           if (XQueryExtension(tmpDisplay, extNames[i],
      81               0 :                               &major_opcode, &first_event, &first_error)
      82                 :               && major_opcode == event->request_code) {
      83               0 :             message.Append(extNames[i]);
      84               0 :             message.Append('.');
      85               0 :             message.AppendInt(event->minor_code);
      86               0 :             break;
      87                 :           }
      88                 :         }
      89                 : 
      90               0 :         XFreeExtensionList(extNames);
      91                 :       }
      92               0 :       XCloseDisplay(tmpDisplay);
      93                 : 
      94                 : #ifdef MOZ_WIDGET_GTK2
      95                 :       // GDK2 calls XCloseDevice the devices that it opened on startup, but
      96                 :       // the XI protocol no longer ensures that the devices will still exist.
      97                 :       // If they have been removed, then a BadDevice error results.  Ignore
      98                 :       // this error.
      99               0 :       if (message.EqualsLiteral("XInputExtension.4") &&
     100                 :           event->error_code == first_error + 0) {
     101               0 :         return 0;
     102                 :       }
     103                 : #endif
     104                 :     }
     105                 :   }
     106                 : 
     107                 :   char buffer[BUFSIZE];
     108               0 :   if (message.IsEmpty()) {
     109               0 :     buffer[0] = '\0';
     110                 :   } else {
     111                 :     XGetErrorDatabaseText(display, "XRequest", message.get(), "",
     112               0 :                           buffer, sizeof(buffer));
     113                 :   }
     114                 : 
     115               0 :   nsCAutoString notes;
     116               0 :   if (buffer[0]) {
     117               0 :     notes.Append(buffer);
     118                 :   } else {
     119               0 :     notes.Append("Request ");
     120               0 :     notes.AppendInt(event->request_code);
     121               0 :     notes.Append('.');
     122               0 :     notes.AppendInt(event->minor_code);
     123                 :   }
     124                 : 
     125               0 :   notes.Append(": ");
     126                 : 
     127                 :   // Get a string to describe the error.
     128               0 :   XGetErrorText(display, event->error_code, buffer, sizeof(buffer));
     129               0 :   notes.Append(buffer);
     130                 : 
     131                 :   // For requests where Xlib gets the reply synchronously, |age| will be 1
     132                 :   // and the stack will include the function making the request.  For
     133                 :   // asynchronous requests, the current stack will often be unrelated to the
     134                 :   // point of making the request, even if |age| is 1, but sometimes this may
     135                 :   // help us count back to the point of the request.  With XSynchronize on,
     136                 :   // the stack will include the function making the request, even though
     137                 :   // |age| will be 2 for asynchronous requests because XSynchronize is
     138                 :   // implemented by an empty request from an XSync, which has not yet been
     139                 :   // processed.
     140               0 :   if (age > 1) {
     141                 :     // XSynchronize returns the previous "after function".  If a second
     142                 :     // XSynchronize call returns the same function after an enable call then
     143                 :     // synchronization must have already been enabled.
     144               0 :     if (XSynchronize(display, True) == XSynchronize(display, False)) {
     145               0 :       notes.Append("; sync");
     146                 :     } else {
     147               0 :       notes.Append("; ");
     148               0 :       notes.AppendInt(PRUint32(age));
     149               0 :       notes.Append(" requests ago");
     150                 :     }
     151                 :   }
     152                 : 
     153                 : #ifdef MOZ_CRASHREPORTER
     154               0 :   switch (XRE_GetProcessType()) {
     155                 :   case GeckoProcessType_Default:
     156                 :   case GeckoProcessType_Plugin:
     157                 :   case GeckoProcessType_Content:
     158               0 :     CrashReporter::AppendAppNotesToCrashReport(notes);
     159               0 :     break;
     160                 :   default: 
     161                 :     ; // crash report notes not supported.
     162                 :   }
     163                 : #endif
     164                 : 
     165                 : #ifdef DEBUG
     166                 :   // The resource id is unlikely to be useful in a crash report without
     167                 :   // context of other ids, but add it to the debug console output.
     168               0 :   notes.Append("; id=0x");
     169               0 :   notes.AppendInt(PRUint32(event->resourceid), 16);
     170                 : #ifdef MOZ_X11
     171                 :   // Actually, for requests where Xlib gets the reply synchronously,
     172                 :   // MOZ_X_SYNC=1 will not be necessary, but we don't have a table to tell us
     173                 :   // which requests get a synchronous reply.
     174               0 :   if (!PR_GetEnv("MOZ_X_SYNC")) {
     175               0 :     notes.Append("\nRe-running with MOZ_X_SYNC=1 in the environment may give a more helpful backtrace.");
     176                 :   }
     177                 : #endif
     178                 : #endif
     179                 : 
     180                 : #ifdef MOZ_WIDGET_QT
     181                 :   // We should not abort here if MOZ_X_SYNC is not set
     182                 :   // until http://bugreports.qt.nokia.com/browse/QTBUG-4042
     183                 :   // not fixed, just print error value
     184                 :   if (!PR_GetEnv("MOZ_X_SYNC")) {
     185                 :     fprintf(stderr, "XError: %s\n", notes.get());
     186                 :     return 0; // temporary workaround for bug 161472
     187                 :   }
     188                 : #endif
     189                 : 
     190               0 :   NS_RUNTIMEABORT(notes.get());
     191               0 :   return 0; // not reached
     192                 : }
     193                 : }
     194                 : 
     195                 : void
     196               0 : InstallX11ErrorHandler()
     197                 : {
     198               0 :   XSetErrorHandler(X11Error);
     199                 : 
     200               0 :   Display *display = mozilla::DefaultXDisplay();
     201               0 :   NS_ASSERTION(display, "No X display");
     202               0 :   if (PR_GetEnv("MOZ_X_SYNC")) {
     203               0 :     XSynchronize(display, True);
     204                 :   }
     205               0 : }

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