gecko/toolkit/xre/nsX11ErrorHandler.cpp

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/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation <http://www.mozilla.org/>
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Karl Tomlinson <karlt+@karlt.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsX11ErrorHandler.h"
#ifdef MOZ_IPC
#include "mozilla/plugins/PluginProcessChild.h"
using mozilla::plugins::PluginProcessChild;
#endif
#include "prenv.h"
#include "nsXULAppAPI.h"
#include "nsExceptionHandler.h"
#include "nsDebug.h"
#include "mozilla/X11Util.h"
#include <X11/Xlib.h>
#define BUFSIZE 2048 // What Xlib uses with XGetErrorDatabaseText
extern "C" {
static int
IgnoreError(Display *display, XErrorEvent *event) {
return 0; // This return value is ignored.
}
static int
X11Error(Display *display, XErrorEvent *event) {
nsCAutoString notes;
char buffer[BUFSIZE];
// Get an indication of how long ago the request that caused the error was
// made. Do this before querying extensions etc below.
unsigned long age = NextRequest(display) - event->serial;
// Ignore subsequent errors, which may get processed during the extension
// queries below for example.
XSetErrorHandler(IgnoreError);
// Get a string to represent the request that caused the error.
nsCAutoString message;
if (event->request_code < 128) {
// Core protocol request
message.AppendInt(event->request_code);
} else {
// Extension request
int nExts;
char** extNames = XListExtensions(display, &nExts);
if (extNames) {
for (int i = 0; i < nExts; ++i) {
int major_opcode, first_event, first_error;
if (XQueryExtension(display, extNames[i],
&major_opcode, &first_event, &first_error)
&& major_opcode == event->request_code) {
message.Append(extNames[i]);
message.Append('.');
message.AppendInt(event->minor_code);
break;
}
}
XFreeExtensionList(extNames);
}
}
if (message.IsEmpty()) {
buffer[0] = '\0';
} else {
XGetErrorDatabaseText(display, "XRequest", message.get(), "",
buffer, sizeof(buffer));
}
if (buffer[0]) {
notes.Append(buffer);
} else {
notes.Append("Request ");
notes.AppendInt(event->request_code);
notes.Append('.');
notes.AppendInt(event->minor_code);
}
notes.Append(": ");
// Get a string to describe the error.
XGetErrorText(display, event->error_code, buffer, sizeof(buffer));
notes.Append(buffer);
// For requests where Xlib gets the reply synchronously, |age| will be 1
// and the stack will include the function making the request. For
// asynchronous requests, the current stack will often be unrelated to the
// point of making the request, even if |age| is 1, but sometimes this may
// help us count back to the point of the request. With XSynchronize on,
// the stack will include the function making the request, even though
// |age| will be 2 for asynchronous requests because XSynchronize is
// implemented by an empty request from an XSync, which has not yet been
// processed.
if (age > 1) {
// XSynchronize returns the previous "after function". If a second
// XSynchronize call returns the same function after an enable call then
// synchronization must have already been enabled.
if (XSynchronize(display, True) == XSynchronize(display, False)) {
notes.Append("; sync");
} else {
notes.Append("; ");
notes.AppendInt(PRUint32(age));
notes.Append(" requests ago");
}
}
#ifdef MOZ_CRASHREPORTER
switch (XRE_GetProcessType()) {
case GeckoProcessType_Default:
CrashReporter::AppendAppNotesToCrashReport(notes);
break;
#ifdef MOZ_IPC
case GeckoProcessType_Plugin:
if (CrashReporter::GetEnabled()) {
// This is assuming that X operations are performed on the plugin
// thread. If plugins are using X on another thread, then we'll need to
// handle that differently.
PluginProcessChild::AppendNotesToCrashReport(notes);
}
break;
#endif
default:
; // crash report notes not supported.
}
#endif
#ifdef DEBUG
// The resource id is unlikely to be useful in a crash report without
// context of other ids, but add it to the debug console output.
notes.Append("; id=0x");
notes.AppendInt(PRUint32(event->resourceid), 16);
#ifdef MOZ_X11
// Actually, for requests where Xlib gets the reply synchronously,
// MOZ_X_SYNC=1 will not be necessary, but we don't have a table to tell us
// which requests get a synchronous reply.
if (!PR_GetEnv("MOZ_X_SYNC")) {
notes.Append("\nRe-running with MOZ_X_SYNC=1 in the environment may give a more helpful backtrace.");
}
#endif
#endif
#ifdef MOZ_WIDGET_QT
// We should not abort here if MOZ_X_SYNC is not set
// until http://bugreports.qt.nokia.com/browse/QTBUG-4042
// not fixed, just print error value
if (!PR_GetEnv("MOZ_X_SYNC")) {
fprintf(stderr, "XError: %s\n", notes.get());
return 0; // temporary workaround for bug 161472
}
#endif
NS_RUNTIMEABORT(notes.get());
return 0; // not reached
}
}
void
InstallX11ErrorHandler()
{
XSetErrorHandler(X11Error);
Display *display = mozilla::DefaultXDisplay();
NS_ASSERTION(display, "No X display");
if (PR_GetEnv("MOZ_X_SYNC")) {
XSynchronize(display, True);
}
}