[Octave-bug-tracker] [bug #31641] fltk print crash on cygwin

[marco atzeri]

Follow-up Comment #7, bug #31641 (project octave):

restarting the search, after long time

the sequence

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

still causes segfault on octave-dev

The cause is system pclose 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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