Assert hit when using native file dialogs

Linux
1

Started the juce demo > widget page > open native Load file dialog > selected a file > boom

JUCE v2.1.5
Time and date: 7 Oct 2013 9:28:58am
User logon name: lucio
Full user name: lucio
Operating system: Linux
Locale: English-USA
Memory size: 16011MB
Number of CPUs: 4
CPU vendor: GenuineIntel
CPU speed: 3101MHz
CPU has MMX: yes
CPU has SSE: yes
CPU has SSE2: yes
CPU has SSE3: yes
CPU has 3DNOW: no
Found network card MAC addresses: 2c-27-d7-19-6d-8d
Found IP addresses: 127.0.0.1, 192.168.10.54
Current working directory: /home/lucio/Projects/juce/extras/JuceDemo/Builds/Linux
Current executable file: /home/lucio/Projects/juce/extras/JuceDemo/Builds/Linux/build/JuceDemo
Current application file: /home/lucio/Projects/juce/extras/JuceDemo/Builds/Linux/build/JuceDemo
User home directory: /home/lucio
User documents directory: /home/lucio
User application data directory: /home/lucio
Common application data directory: /var
Temp directory: /var/tmp

[New Thread 0x7ffff5100700 (LWP 22547)]
JUCE Assertion failure in juce_File.cpp:152
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007ffff5d56287 in kill () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff5d56287 in kill () from /lib64/libc.so.6
#1  0x0000000000564344 in juce::File::parseAbsolutePath (p=...) at ../../../../modules/juce_core/files/juce_File.cpp:152
#2  0x0000000000563dfd in juce::File::File (this=0x7fffffffc440, fullPathName=...) at ../../../../modules/juce_core/files/juce_File.cpp:30
#3  0x0000000000760969 in juce::FileChooser::showPlatformDialog (results=..., title=..., file=..., isDirectory=false, isSave=false, selectMultipleFiles=true)
    at ../../../../modules/juce_gui_basics/native/juce_linux_FileChooser.cpp:146
#4  0x00000000006fc435 in juce::FileChooser::showDialog (this=0x7fffffffd460, flags=21, previewComp=0x0)
    at ../../../../modules/juce_gui_basics/filebrowser/juce_FileChooser.cpp:109
#5  0x00000000006fc1eb in juce::FileChooser::browseForMultipleFilesToOpen (this=0x7fffffffd460, previewComp=0x0)
    at ../../../../modules/juce_gui_basics/filebrowser/juce_FileChooser.cpp:53
#6  0x000000000043ed42 in WidgetsDemo::performDemoMenuItem (this=0xf1aeb0, result=121) at ../../Source/demos/WidgetsDemo.cpp:1304
#7  0x000000000043e299 in WidgetsDemo::menuItemChosenCallback (result=121, demoComponent=0xf1aeb0) at ../../Source/demos/WidgetsDemo.cpp:1181
#8  0x000000000044164b in juce::ModalCallbackFunction::ComponentCaller1<WidgetsDemo>::modalStateFinished (this=0xf627b0, returnValue=121)
    at ../../Source/demos/../../JuceLibraryCode/modules/juce_audio_processors/../../../../../modules/juce_audio_processors/../juce_gui_basics/components/juce_ModalComponentManager.h:326
#9  0x00000000006dd736 in juce::ModalComponentManager::handleAsyncUpdate (this=0xefb430)
    at ../../../../modules/juce_gui_basics/components/juce_ModalComponentManager.cpp:197
#10 0x00000000005fdc29 in juce::AsyncUpdater::AsyncUpdaterMessage::messageCallback (this=0xefcdb0)
    at ../../../../modules/juce_events/broadcasters/juce_AsyncUpdater.cpp:33
#11 0x00000000005ff427 in juce::InternalMessageQueue::dispatchNextInternalMessage (this=0xeeaab0)
    at ../../../../modules/juce_events/native/juce_linux_Messaging.cpp:202
#12 0x00000000005feea0 in juce::InternalMessageQueue::dispatchNextEvent (this=0xeeaab0) at ../../../../modules/juce_events/native/juce_linux_Messaging.cpp:95
#13 0x00000000005fd269 in juce::MessageManager::dispatchNextMessageOnSystemQueue (returnIfNoPendingMessages=false)
    at ../../../../modules/juce_events/native/juce_linux_Messaging.cpp:388
#14 0x00000000005f9d34 in juce::MessageManager::runDispatchLoopUntil (this=0xeea9b0, millisecondsToRunFor=-1)
    at ../../../../modules/juce_events/messages/juce_MessageManager.cpp:115
#15 0x00000000005f9c89 in juce::MessageManager::runDispatchLoop (this=0xeea9b0) at ../../../../modules/juce_events/messages/juce_MessageManager.cpp:96
#16 0x00000000005f91fa in juce::JUCEApplicationBase::main () at ../../../../modules/juce_events/messages/juce_ApplicationBase.cpp:235
#17 0x00000000005f9122 in juce::JUCEApplicationBase::main (argc=1, argv=0x7fffffffdb58)
    at ../../../../modules/juce_events/messages/juce_ApplicationBase.cpp:213
#18 0x000000000040c0a9 in main (argc=1, argv=0x7fffffffdb58) at ../../Source/ApplicationStartup.cpp:174

 

2

I think that in juce_linux_FileChooser.cpp, this does not work in ChildProcess, and probably it's a warning output to stderr which mess up the file name:

args.add ("2>/dev/null");
3

It's only a warning assertion - I think if you ignore it, it'd probably work ok. But I've added some code to avoid the assertion, so try it again now.

4

no the problem is that in this machine, zenity launched without "2>/dev/null" produces some warnings, and those warnings gets returned and parsed by the ChildProcess::readAllOutput even if you pass "2>/dev/null" as the last argument of execvp (cause you are actually reading stderr from a pipe, regardless of any redirect you may have setup).

So in the end, passing "2>/dev/null" as last arg of ChildProcess doesn't achieve what you want to do.

5

This seems to fix the problems, it's a quick and dirty hack but makes the "2>/dev/null" passed in ChildProcess arguments work:

diff --git a/modules/juce_core/native/juce_posix_SharedCode.h b/modules/juce_core/native/juce_posix_SharedCode.h
index 917be77..83285a5 100644
--- a/modules/juce_core/native/juce_posix_SharedCode.h
+++ b/modules/juce_core/native/juce_posix_SharedCode.h
@@ -1007,7 +1007,10 @@ public:
                 // we're the child process..
                 close (pipeHandles[0]);   // close the read handle
                 dup2 (pipeHandles[1], 1); // turns the pipe into stdout
-                dup2 (pipeHandles[1], 2); //  + stderr
+                if (arguments.contains("2>/dev/null"))
+                    close(STDERR_FILENO);
+                else
+                    dup2 (pipeHandles[1], 2); //  + stderr
                 close (pipeHandles[1]);
 
                 Array<char*> argv;

Any chance to slip in a fix for this ?

6

Thanks, I've made a slightly less hacky fix! Would be great if you could give it a try and let me know if it works!

7

this finally fixed it... thanx !