<AWT Dev> [8] Review request for 7123476: DesktopOpenTests:When enter the file path and click the open button, it crash

Artem Ananiev artem.ananiev at oracle.com
Fri Apr 6 03:51:27 PDT 2012

Hi, Denis,

just a minor question.

In gtk2_show_uri_load(), why isn't it enough to check fp_gtk_show_uri 
for NULL? For example, if this var is not NULL, why do we care about GTK 



On 4/2/2012 4:35 PM, Denis S. Fokin wrote:
> Hi Anthony,
> I took you suggestions into account. I have not Please take another look.
> http://cr.openjdk.java.net/~denis/7123476/webrev.04/
> Thank you,
> Denis.
> On 3/29/2012 4:48 PM, Anthony Petrov wrote:
>> Hi Denis,
>> It's not that I'm insisting on anything. I'm just looking into the
>> gnome_interface.c code and seeing that we both check the return value
>> for NULL as well as check the dlerror() status. I would like to see some
>> consistency between loading the GTK and Gnome libs in this regard.
>> Also, please take a look at man dlsym, it says:
>>> dlsym()
>>> The function dlsym() takes a "handle" of a dynamic library returned by
>>> dlopen() and the null-terminated symbol name, returning the address
>>> where that symbol is loaded into memory. If the symbol is not
>>> found, in the specified library or any of the libraries that were
>>> automatically loaded by dlopen() when that library was loaded, dlsym()
>>> returns NULL. (The search performed by dlsym() is breadth first
>>> through the dependency tree of these libraries.) Since the value of
>>> the symbol could actually be NULL (so that a NULL return from dlsym()
>>> need not indicate an error), the correct way to test for an error
>>> is to call dlerror() to clear any old error conditions, then call
>>> dlsym(), and then call dlerror() again, saving its return value into a
>>> variable, and check whether this saved value is not NULL.
>> I realize that while a NULL pointer may be a valid return value for
>> dlsym(), it's useless for our purposes and is very unlikely to happen in
>> this case anyway. However, if I read the specification of dlsym()
>> correctly, since we're going to call a function referenced by the return
>> value of dlsym(), we must check it for NULL as well as check the
>> dlerror() status. If any of this indicates an error, we should assume
>> that the init() function has failed, and hence should return FALSE.
>> --
>> best regards,
>> Anthony
>> On 03/28/12 21:14, Denis S. Fokin wrote:
>>> Hi Anthony,
>>> thank you for the review notes.
>>> Actually, I expect that if fp_gtk_show_uri is null we have some kind of
>>> dlerror. Anyway I check fp_gtk_show_uri in
>>> Java_sun_awt_X11_XDesktopPeer_gnome_1url_1show. So I would not add
>>> additional check here. But if you insist I will add the NULL check.
>>> Thank you,
>>> Denis.
>>> On 3/28/2012 7:01 PM, Anthony Petrov wrote:
>>>> Hi Denis,
>>>> src/solaris/native/sun/xawt/gnome_interface.c
>>>>> 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights
>>>>> reserved.
>>>> I think this file has just been created in 2012 :)
>>>>> 30 fprintf(stderr, "gnome_load\n");
>>>> Please remove all the debugging output, or put it under the #ifdef
>>>>> 70 fprintf(stderr, "can not find symble gnome_url_show\n");
>>>> s/symble/symbol/
>>>> src/solaris/native/sun/awt/gtk2_interface.c
>>>>> 447 return TRUE;
>>>> I think it also makes sense to check fp_gtk_show_uri for NULL before
>>>> returning TRUE here.
>>>> The rest of the fix looks fine to me. Thank you!
>>>> --
>>>> best regards,
>>>> Anthony
>>>> On 3/27/2012 5:03 PM, Denis S. Fokin wrote:
>>>>> Hi Anthony,
>>>>> here is a new version of the fix.
>>>>> http://cr.openjdk.java.net/~denis/7123476/webrev.03/
>>>>> I took into account you suggestions. Now the implementation loads gtk
>>>>> API if it exists on the library path. If it does not exists we try to
>>>>> load gnome API. If it is not successful we do not support the
>>>>> functionality.
>>>>> I introduced a couple of files to keep gnome interface separately like
>>>>> we do with gtk. I expect that we remove them as soon as all our
>>>>> supported OS configurations will be have installed the proper GTK
>>>>> library by default.
>>>>> As for the synchronization section, I do not see how to use the
>>>>> fp_gdk_threads_* functions with gnome API so I put the critical under
>>>>> gtk-specific if-clause section.
>>>>> Thank you,
>>>>> Denis.
>>>>> On 2/1/2012 9:03 PM, Anthony Petrov wrote:
>>>>>> Hi Denis,
>>>>>> The gtk_show_uri() is available since GTK 2.14. Did you verify if all
>>>>>> platforms supposed to be supported by JDK 8 have this version of GTK
>>>>>> libraries installed by default? I'm mostly concerned about Solaris
>>>>>> systems, as well as corporate Linux desktops. If this is not the
>>>>>> case,
>>>>>> then perhaps using this function should be conditional, and with the
>>>>>> old
>>>>>> GTK library we should fall back to using the old API. You may notice
>>>>>> that, for example, for the file chooser we have an explicit check for
>>>>>> GTK 2.8.0 and use the new
>>>>>> gtk_file_chooser_set_do_overwrite_confirmation() API only when it's
>>>>>> available.
>>>>>> I like that we move all the GTK-related utility code to the
>>>>>> gtk2_interface files. A few comments:
>>>>>> 1. Please use the TRUE and FALSE constants instead of 1 and 0 as a
>>>>>> return value for gtk2_show_uri_load().
>>>>>> 2. Should the fprintf() call be #ifdef'ed for INTERNAL_BUILD's only?
>>>>>> --
>>>>>> best regards,
>>>>>> Anthony
>>>>>> On 2/1/2012 7:39 PM, Denis S. Fokin wrote:
>>>>>>> Hi AWT team,
>>>>>>> Please review a fix for the CR 7123476 at
>>>>>>> http://cr.openjdk.java.net/~denis/7123476/webrev.01
>>>>>>> CR URL:
>>>>>>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7123476
>>>>>>> The Gnome API is deprecated so we need to migrate on GTK function.
>>>>>>> See
>>>>>>> the next thread.
>>>>>>> http://mail.gnome.org/archives/gnome-devel-list/2009-January/msg00004.html
>>>>>>> Thank you,
>>>>>>> Denis.

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