[webkit-gtk] Handling Plugins and Error scanning plugin
Nicolas Jäger
jagernicolas at legtux.org
Wed Jan 21 01:35:36 PST 2015
On Wed, 21 Jan 2015 10:10:23 +0100
Carlos Garcia Campos <cgarcia at igalia.com> wrote:
Hi,
> El mié, 21-01-2015 a las 03:59 -0500, Nicolas Jäger escribió:
> > hi,
> >
> > > The GAsyncResult you're passing to
> > > webkit_web_context_get_plugins_finish() is uninitialized. It's
> > > passed as the second argument to your callback, so you should
> > > declare at least that many parameters.
> > ok, to be honnest, I don't really understand what do and from where
> > come these asynchronous function. I'm just passing some pointers as
> > you told me :
> >
> > void
> > callback( WebKitWebContext *web_context
> > , GAsyncResult *result
> > )
> > {
> > GList *plugin_list, *p;
> > GError *error = nullptr;
> >
> > plugin_list = webkit_web_context_get_plugins_finish (web_context,
> > result, &error); if( error )
> > {
> > std::cout<< error->message << std::endl;
> > exit(1);
> > }
> >
> >
> > for (p = plugin_list; p; p = p->next)
> > {
> > WebKitPlugin *plugin = WEBKIT_PLUGIN (p->data);
> > std::cout << webkit_plugin_get_name (plugin) << std::endl;
> > g_object_unref(p->data);
> > }
> >
> > g_list_free(plugin_list);
> >
> > }
> >
> > >
> > > You should also pass a GError unless you're sure you want to
> > > silence errors. Something like this is typical:
> > done.
> >
> > so now when I start the browser, I still have some error messages,
> >
> > Error scanning
> > plugin /usr/lib/mozilla/plugins/gecko-mediaplayer-dvx.so, /usr/lib/webkit2gtk-4.0/WebKitPluginProcess
> > returned 256 exit status Error scanning
> > plugin /usr/lib/mozilla/plugins/gecko-mediaplayer-qt.so, /usr/lib/webkit2gtk-4.0/WebKitPluginProcess
> > returned 256 exit status Error scanning
> > plugin /usr/lib/mozilla/plugins/gecko-mediaplayer-rm.so, /usr/lib/webkit2gtk-4.0/WebKitPluginProcess
> > returned 256 exit status Error scanning
> > plugin /usr/lib/mozilla/plugins/mozplugger.so, /usr/lib/webkit2gtk-4.0/WebKitPluginProcess
> > returned 256 exit status
>
> These errors are harmless, it's because the plugin scanner fails to
> get plugin information from those .so, typically because they are not
> NPAPI plugins.
>
> > but no more segmentation fault (I guess it was because of the
> > nullptr). I tested to go on several websites, I got no trouble
> > except for one site : YOUTUBE. No prob with dailymotion, several
> > broadcast news neither, just youtube!
> >
> > there a copy of the errors :
> >
> >
> > [BEGIN OF ERRORS]
> >
> > (WebKitWebProcess:3600): GLib-GObject-WARNING **: invalid (NULL)
> > pointer instance
> >
> > (WebKitWebProcess:3600): GLib-GObject-CRITICAL **:
> > g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)'
> > failed 1
> > 0xb4727ce3 /usr/lib/libjavascriptcoregtk-4.0.so.18(WTFCrash+0x23)
> > [0xb4727ce3] 2
> > 0xb473473b /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3WTF11fastReallocEPvj+0x1db)
> > [0xb473473b] 3
> > 0xb425acaf /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC17BytecodeGenerator8generateEv+0x67f)
> > [0xb425acaf] 4
> > 0xb457a352 /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC9CodeCache18getGlobalCodeBlockINS_24UnlinkedProgramCodeBlockENS_17ProgramExecutableEEEPT_RNS_2VMEPT0_RKNS_10SourceCodeENS_18JSParserStrictnessENS_12DebuggerModeENS_12ProfilerModeERNS_11ParserErrorE+0x5d2)
> > [0xb457a352] 5
> > 0xb4576e2f /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC9CodeCache19getProgramCodeBlockERNS_2VMEPNS_17ProgramExecutableERKNS_10SourceCodeENS_18JSParserStrictnessENS_12DebuggerModeENS_12ProfilerModeERNS_11ParserErrorE+0x2f)
> > [0xb4576e2f] 6
> > 0xb45d9695 /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC14JSGlobalObject22createProgramCodeBlockEPNS_9ExecStateEPNS_17ProgramExecutableEPPNS_8JSObjectE+0xf5)
> > [0xb45d9695] 7
> > 0xb45a91c8 /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC17ProgramExecutable26initializeGlobalPropertiesERNS_2VMEPNS_9ExecStateEPNS_7JSScopeE+0x58)
> > [0xb45a91c8] 8
> > 0xb4453260 /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC11Interpreter7exec
> > 9
> > 0xb458e23c /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3JSC8evaluateEPNS_9Exe
> > 10 0xb5d34d78 /usr/lib/libwebkit2gtk-4.0.so.37(+0x55dd78)
> > [0xb5d34d78] 11
> > 0xb5d35045 /usr/lib/libwebkit2gtk-4.0.so.37(+0x55e045) [0xb5d35045]
> > 12 0xb5f19564 /usr/lib/libwebkit2gtk-4.0.so.37(+0x742564)
> > [0xb5f19564] 13
> > 0xb5f19da0 /usr/lib/libwebkit2gtk-4.0.so.37(+0x742da0) [0xb5f19da0]
> > 14 0xb5f1d046 /usr/lib/libwebkit2gtk-4.0.so.37(+0x746046)
> > [0xb5f1d046] 15
> > 0xb5f1db9b /usr/lib/libwebkit2gtk-4.0.so.37(+0x746b9b) [0xb5f1db9b]
> > 16 0xb5f1da66 /usr/lib/libwebkit2gtk-4.0.so.37(+0x746a66)
> > [0xb5f1da66] 17
> > 0xb63a0fee /usr/lib/libwebkit2gtk-4.0.so.37(+0xbc9fee) [0xb63a0fee]
> > 18 0xb63a1022 /usr/lib/libwebkit2gtk-4.0.so.37(+0xbca022)
> > [0xb63a1022] 19
> > 0xb676b31b /usr/lib/libwebkit2gtk-4.0.so.37(+0xf9431b) [0xb676b31b]
> > 20
> > 0xb477257f /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3WTF15GMainLoopSource1
> > 21
> > 0xb476e0af /usr/lib/libjavascriptcoregtk-4.0.so.18(_ZN3WTF15GMainLoopSource1
> > 22 0xb476e0fc /usr/lib/libjavascriptcoregtk-4.0.so.18(+0x6a90fc)
> > [0xb476e0fc] 23
> > 0xb48ad8d3 /usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x153)
> > [0xb48ad 24 0xb48adce9 /usr/lib/libglib-2.0.so.0(+0x46ce9)
> > [0xb48adce9] 25
> > 0xb48ae099 /usr/lib/libglib-2.0.so.0(g_main_loop_run+0xf9)
> > [0xb48ae099] 26
> > 0xb6f9f369 /usr/lib/libwebkit2gtk-4.0.so.37(+0x17c8369)
> > [0xb6f9f369] 27
> > 0xb5bd7a67 /usr/lib/libwebkit2gtk-4.0.so.37(WebProcessMainUnix+0x1d7)
> > [0xb5b 28
> > 0x80485c2 /usr/lib/webkit2gtk-4.0/WebKitWebProcess(main+0x32)
> > [0x80485c2] 29
> > 0xb5635e5e /usr/lib/libc.so.6(__libc_start_main+0xde) [0xb5635e5e]
> > 30 0x80485ee /usr/lib/webkit2gtk-4.0/WebKitWebProcess() [0x80485ee]
> >
> > [END OF ERRORS]
> >
> > I really have no idea how to deal with that, as you can see there
> > is no error from the callback function. I can see at the very first
> > line a story about a null pointer, do I forget to set something ? I
> > searched during several hours from now, but I don't have any begin
> > of clue.
>
> The crash looks unrelated, since it's a WebProcess crash, or does it
> only happen when you try to get the list of plugins?
do you mean with the scanns errors ? they are not related.
>
> > Then I wanted to switch the javascript plugins, since the word
> > javascript appears several times in the errors. At this point I went
> > here :
> >
> > https://wiki.gnome.org/Projects/WebKitGtk/ProgrammingGuide/Cookbook#Executing_JavaScript
> >
> > this section of the website seems outdated, here is my code :
> >
> > WebKitWebView* webview;
> > WebKitSettings *settings;
> > webview = WEBKIT_WEB_VIEW( webkit_web_view_new() );
> > settings = webkit_settings_new ();
> > std::cout << webkit_settings_get_enable_javascript(settings) <<
> > std::endl;
> > webkit_settings_set_enable_javascript(settings,false/*true*/);
> > webkit_web_view_set_settings ( webview, settings ); std::cout <<
> > webkit_settings_get_enable_javascript(settings) << std::endl;
> >
> > now, when javascript is disabled, I can go without any error (even
> > without those about scanning) on youtube, but of course youtube
> > asks me to turn it on, and I have no video
>
> What WebKitGTK+ version?
webkit2gtk 2.6.5-1
if for any reason you want to see my whole code, it's possible, it's
only a personnal project.
regards,
/nicoo
>
> > regards,
> > /nicoo
> > _______________________________________________
> > webkit-gtk mailing list
> > webkit-gtk at lists.webkit.org
> > https://lists.webkit.org/mailman/listinfo/webkit-gtk
> >
>
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