[Wt-interest] WGLWidget and libwtfcgi

[Helmar Spangenberg]

Hello,

is there any issue on on the WGLWidget with regards to libwtfcgi?

I wrote a program containing a slightly modified version of the
teapot-example. Using libwthttp everything works fine. However, switching
over to libwtfcgi, wtfcgi crashes - apache says: wtfcgi: connect():
Connection refused

I made some checks - I have the feeling that the crash happens in the
constructor of WGLWidget.

Can anybody give me a hint what I could do to get rid of the crashes?

The underlying system is SuSE-13.2 (64 bit).

Thank you,
Helmar

[Wim Dumon]

Not that I know of, I believe it should work. Can you get a stack trace?

Wim.

Post by Helmar Spangenberg
Hello,
is there any issue on on the WGLWidget with regards to libwtfcgi?
I wrote a program containing a slightly modified version of the
teapot-example. Using libwthttp everything works fine. However, switching
Connection refused
I made some checks - I have the feeling that the crash happens in the
constructor of WGLWidget.
Can anybody give me a hint what I could do to get rid of the crashes?
The underlying system is SuSE-13.2 (64 bit).
Thank you,
Helmar
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[Helmar Sgpangenber]

How can I produce a stack trace?
Helmar

[Pau Garcia i Quiles]

Hello,

Run your webserver inside gdb. When you get the crash, enter the
'backtrace' command.

http://httpd.apache.org/dev/debugging.html

You'll need the debuggin symbols. If OpenSuse does not provide them, you'll
need to compile Wt from source. If you recompile Wt, the crash may be gone
forever. I spent a lot of time trying to find out why the wt-homepage
example crashed on Debian 7.0, to no avail: the moment I recompiled, even
with the same compiler and libraries, the problem disappeared. I'm not
saying that'll happen to you but don't be surprised. Some bugs are very
very very tricky. Others simply don't exist.

Post by Helmar Sgpangenber
How can I produce a stack trace?
Helmar
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Performance metrics, stats and reports that give you Actionable Insights
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[Helmar Sgpangenber]

Helmar Spangenberg <***@...> writes:

Seems it was all my fault - sorry. The permissions of /var/run/wt were
somwewhat screwed up, thus no communication was possible between the
different fcgi-instances.

Anyway, thanks a lot for your help!! :-)
Helmar