[Octave-bug-tracker] [bug #34263] print with fltk always SEGFAULT

[marco atzeri]

URL:
  <http://savannah.gnu.org/bugs/?34263>

                 Summary: print with fltk always SEGFAULT
                 Project: GNU Octave
            Submitted by: matzeri
            Submitted on: Sat 10 Sep 2011 07:50:00 AM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Microsoft Windows

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Details:

on cygwin the sequence

graphics_toolkit fltk;
x=1:10;
plot (x,x)
print (fltk.png","-dpng")

causes segfault.

The cause is system pclose(fp) called with a 
NULL handler for the involved pipe

(gdb) p fp
$6 = (FILE *) 0x20204f94
(gdb) call fileno(fp)
$7 = 6
p fh
$8 = (fhandler_pipe *) 0x0 


One strange issues:

changing the sequence to

graphics_toolkit fltk;
rand(3);
plot (x)
set (gcf,'visible','off')
print (gcf,"test_invisible.png","-dpng")
set (gcf,'visible','on')

the segfault is not on the print but on the last set






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