[Octave-bug-tracker] [bug #44387] unwind_protect_cleanup apparently fails to run when calling graphics C++ code

[Dan Sebald]

Follow-up Comment #11, bug #44387 (project octave):

For FLTK --no-gui flag, I now get pretty much the same as what you report,
except perhaps you have more error messages.

Good hypothesis on your part.  I've recompile with this change:


                if (nwrite != nread)
                  {
//                    octave::signal_handler ();   // Clear SIGPIPE signal
//                    error ("gl2ps_renderer::draw: internal pipe error");
                  }


and the segfault is gone:


>> print -dfoo tst.eps
Unknown device: foo
Unrecoverable error: undefined in .uninstallpagedevice
Operand stack:
    defaultdevice
warning: broken pipe
>>


So, I recompile again with just this change:


                if (nwrite != nread)
                  {
//                    octave::signal_handler ();   // Clear SIGPIPE signal
                    error ("gl2ps_renderer::draw: internal pipe error");
                  }


and get segfault again.  With this change


                if (nwrite != nread)
                  {
                    octave::signal_handler ();   // Clear SIGPIPE signal
//                    error ("gl2ps_renderer::draw: internal pipe error");
                  }


I see "warning: broken pipe" a hundred plus times.  That seems backward to me,
but it's beside the point.  The call to error() is the problem, as you
surmised.


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