#51093 [NEW]: segfault with signal_autoconnect function of class GladeXML
[email protected] ("jboffel at gmail dot com") Fri, 19 Feb 2010 19:45:33 GMT
| Newsgroups | php.gtk.dev |
|---|---|
| Message-ID | <[email protected]> |
From: jboffel at gmail dot com
Operating system: any GNU/Linux at least
PHP version: 5.2.12
PHP Bug Type: PHP-GTK related
Bug description: segfault with signal_autoconnect function of class GladeXML
Description:
------------
PHP-GTK2 last stable version : 2.0.1
I found a case you can have a segfault by using signal_autoconnect
function of class GaldeXML of php-gtk2 extension.
The code example below just create a single window with 2 buttons.
Click on Refresh button is supposed to print the result of phpinfo() in a
textarea.
But when you do so, sometimes you'll get a segfault or a fatal error about
a too large amount of memory requested during one allocation.
I identified the problem, no copy are done of the optional parameter given
to signal_autoconnect function. So right after using the function, the
array given in parameter is detroyed as nobody still have a reference on
it. And so it's no more available when the signal callback function is
executed...
You can add this line in file: php-gtk-2.0.1/ext/libglade/gen_libglade.c
on line: 351
zval_copy_ctor(map);
It worked for me as expected.
It could be claimed that it's not a bug as you can create a variable
previously and give it as parameter to the function, that would do the job,
but if any modification and/or unset are done before data are used, the
result will be unexpected for sure. I can't think it's the expected
behavior.
Reproduce code:
---------------
Main code :
<?php
$glade = new GladeXML(dirname(__FILE__) . '/helloglade.glade');
$glade->signal_autoconnect(array(
'on_Refresh_clicked'=>array(NULL, $glade)
));
function on_Refresh_clicked($button, $glade) {
$phpinfo_window=$glade->get_widget('phpinfo_window');
$textBuffer = new GtkTextBuffer();
ob_start () ;
phpinfo () ;
$pinfo = ob_get_contents () ;
ob_end_clean () ;
$textBuffer->set_text($pinfo);
$phpinfo_window->set_buffer($textBuffer);
}
function gtk_main_quit() {
Gtk::main_quit();
}
Gtk::main();
?>
Find here my helloglade.glade file auto-generated by gnome glade
interface:
<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">
<glade-interface>
<widget class="GtkWindow" id="main">
<property name="visible">True</property>
<property name="title" translatable="yes">phpinfo()</property>
<property name="type">GTK_WINDOW_TOPLEVEL</property>
<property name="window_position">GTK_WIN_POS_NONE</property>
<property name="modal">False</property>
<property name="default_width">700</property>
<property name="default_height">500</property>
<property name="resizable">True</property>
<property name="destroy_with_parent">True</property>
<property name="decorated">True</property>
<property name="skip_taskbar_hint">False</property>
<property name="skip_pager_hint">False</property>
<property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
<property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
<property name="focus_on_map">True</property>
<property name="urgency_hint">False</property>
<accessibility>
<atkproperty name="AtkObject::accessible_name"
translatable="yes">main</atkproperty>
</accessibility>
<child>
<widget class="GtkVBox" id="vbox1">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>
<child>
<widget class="GtkScrolledWindow" id="scrolledwindow1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="hscrollbar_policy">GTK_POLICY_NEVER</property>
<property name="vscrollbar_policy">GTK_POLICY_NEVER</property>
<property name="shadow_type">GTK_SHADOW_IN</property>
<property
name="window_placement">GTK_CORNER_TOP_LEFT</property>
<child>
<widget class="GtkViewport" id="viewport1">
<property name="visible">True</property>
<property name="shadow_type">GTK_SHADOW_IN</property>
<child>
<widget class="GtkTable" id="table1">
<property name="visible">True</property>
<property name="n_rows">2</property>
<property name="n_columns">1</property>
<property name="homogeneous">False</property>
<property name="row_spacing">0</property>
<property name="column_spacing">0</property>
<child>
<widget class="GtkScrolledWindow"
id="scrolledwindow2">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property
name="hscrollbar_policy">GTK_POLICY_ALWAYS</property>
<property
name="vscrollbar_policy">GTK_POLICY_ALWAYS</property>
<property
name="shadow_type">GTK_SHADOW_IN</property>
<property
name="window_placement">GTK_CORNER_TOP_LEFT</property>
<child>
<widget class="GtkTextView" id="phpinfo_window">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="editable">True</property>
<property name="overwrite">False</property>
<property name="accepts_tab">True</property>
<property
name="justification">GTK_JUSTIFY_LEFT</property>
<property
name="wrap_mode">GTK_WRAP_NONE</property>
<property name="cursor_visible">True</property>
<property
name="pixels_above_lines">0</property>
<property
name="pixels_below_lines">0</property>
<property
name="pixels_inside_wrap">0</property>
<property name="left_margin">0</property>
<property name="right_margin">0</property>
<property name="indent">0</property>
<property name="text"
translatable="yes"></property>
</widget>
</child>
</widget>
<packing>
<property name="left_attach">0</property>
<property name="right_attach">1</property>
<property name="top_attach">1</property>
<property name="bottom_attach">2</property>
<property name="x_options">fill</property>
</packing>
</child>
<child>
<widget class="GtkLabel" id="label1">
<property name="visible">True</property>
<property name="label" translatable="yes">Contenu du
résultat de phpinfo :</property>
<property name="use_underline">False</property>
<property name="use_markup">False</property>
<property
name="justify">GTK_JUSTIFY_LEFT</property>
<property name="wrap">False</property>
<property name="selectable">False</property>
<property name="xalign">0</property>
<property name="yalign">0.5</property>
<property name="xpad">0</property>
<property name="ypad">0</property>
<property
name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
<property name="width_chars">-1</property>
<property name="single_line_mode">False</property>
<property name="angle">0</property>
</widget>
<packing>
<property name="left_attach">0</property>
<property name="right_attach">1</property>
<property name="top_attach">0</property>
<property name="bottom_attach">1</property>
<property name="y_options"></property>
</packing>
</child>
</widget>
</child>
</widget>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
</packing>
</child>
<child>
<widget class="GtkHButtonBox" id="hbuttonbox1">
<property name="visible">True</property>
<property
name="layout_style">GTK_BUTTONBOX_DEFAULT_STYLE</property>
<property name="spacing">0</property>
<child>
<widget class="GtkButton" id="Close">
<property name="visible">True</property>
<property name="can_default">True</property>
<property name="can_focus">True</property>
<property name="label">gtk-close</property>
<property name="use_stock">True</property>
<property name="relief">GTK_RELIEF_NORMAL</property>
<property name="focus_on_click">True</property>
<signal name="clicked" handler="gtk_main_quit"
last_modification_time="Wed, 17 Feb 2010 17:03:35 GMT"/>
</widget>
</child>
<child>
<widget class="GtkButton" id="Refresh">
<property name="visible">True</property>
<property name="can_default">True</property>
<property name="can_focus">True</property>
<property name="label"
translatable="yes">Refresh</property>
<property name="use_underline">True</property>
<property name="relief">GTK_RELIEF_NORMAL</property>
<property name="focus_on_click">True</property>
<signal name="clicked" handler="on_Refresh_clicked"
object="glade" last_modification_time="Wed, 17 Feb 2010 17:03:14 GMT"/>
</widget>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">True</property>
</packing>
</child>
</widget>
</child>
</widget>
</glade-interface>
Expected result:
----------------
A windows with a textarea showing phpinfo() result.
Actual result:
--------------
segfault / Fatal Error, depending of memory state.
--
Edit bug report at http://bugs.php.net/?id=51093&edit=1
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