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Date:	Thu, 08 Sep 2011 13:51:57 +0200
From:	Marco atzeri <marco DOT atzeri AT gmail DOT com>
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Subject:	Re: debugging SIGSEV on pclose
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On 9/8/2011 12:20 PM, jojelino wrote:
> On 2011-09-08 PM 6:50, Marco atzeri wrote:
>> I am currently using debug version of cygwin-cvs, flkt-1.10 and octave;
>> but unfortunaltely the gdb backtrace is already corrupted/unclear at the
>> popen call, and I do not know if is real problem on a GDB issue :
>>
>> -------------------------------------------------------------------------------
>>
>>
> you need to do b _sigfe_popen, because the generated sigfe.s doesn't
> emit any sort of dwarf 2 cfi, which gdb needed to backtrace.
>

thanks,
very useful

Breakpoint 4, 0x610d0843 in _sigfe_pclose () from /usr/bin/cygwin1.dll
(gdb) bt
#0  0x610d0843 in _sigfe_pclose () from /usr/bin/cygwin1.dll
#1  0x61e041c5 in _fu14___ZNSs4_Rep20_S_empty_rep_storageE ()
     at ../../octave/src/DLD-FUNCTIONS/__init_fltk__.cc:166
#2  0x68441a03 in Fl_Gl_Window::flush (this=0x206bbf30) at 
Fl_Gl_Window.cxx:347
#3  0x0b68171f in flush (this=<optimized out>) at ../FL/x.H:126

and it matches the octave source code
----------------------------------------------
     if (print_mode)
       {
         FILE *fp = octave_popen (print_cmd.c_str (), "w");
         glps_renderer rend (fileno (fp), print_term);

         rend.draw (gh_manager::get_object (number));

         octave_pclose (fp);
         print_mode = false;
----------------------------------------------

regards
Marco

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