# To subscribers of the xforms list from Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> :
Hello,
I promised to write an example program as simple as possible that still
crashes with a segmentation fault on flimage_free( ). Here it is:
-----8<---- snip here ---------------------------------------------------
#include <stdlib.h>
#include <forms.h>
typedef struct {
FL_FORM *flimage;
void *vdata;
char *cdata;
long ldata;
FL_OBJECT *canvas;
} FD_flimage;
FD_flimage *create_form_flimage( void );
int main( int argc, char *argv[ ] )
{
Display *d;
FD_flimage *flimage;
Pixmap pm;
FL_IMAGE *fl_image;
if ( ( d = fl_initialize( &argc, argv, "flimage", NULL, 0 ) ) == NULL )
return EXIT_FAILURE;
flimage = create_form_flimage( );
fl_show_form( flimage->flimage, FL_PLACE_MOUSE, FL_FULLBORDER,
"flimage" );
pm = XCreatePixmap( d, FL_ObjWin( flimage->canvas ), 100, 100,
fl_get_canvas_depth( flimage->canvas ) );
if ( ( fl_image = flimage_alloc( ) ) == NULL )
return EXIT_FAILURE;
flimage_from_pixmap( fl_image, pm );
flimage_dump( fl_image, "/tmp/xx.ppm", "PPM" );
flimage_free( fl_image );
XFreePixmap( d, pm );
fl_hide_form( flimage->flimage );
fl_free_form( flimage->flimage );
return EXIT_SUCCESS;
}
FD_flimage *create_form_flimage( void )
{
FL_OBJECT *obj;
FD_flimage *fdui = ( FD_flimage * ) fl_calloc( 1, sizeof *fdui );
fdui->flimage = fl_bgn_form( FL_NO_BOX, 100, 100 );
obj = fl_add_box( FL_UP_BOX, 0, 0, 100, 100, "" );
fdui->canvas = obj = fl_add_canvas( FL_NORMAL_CANVAS, 0, 0, 100, 100, ""
);
fl_end_form();
fdui->flimage->fdui = fdui;
return fdui;
}
-----8<---- snip here ---------------------------------------------------
I compile it using gcc version 2.95.3 with
CFLAGS="-ggdb -Wall -W -I/usr/X11R6/include"
LDFALGS="-L/usr/X11R6/lib -lX11 -lforms -lm"
and get an executable named flimage. Running ldd on it gives:
jens@dorimare:~/Programming/TESTS/flimage> ldd flimage
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40023000)
libforms.so.0.89 => /usr/X11R6/lib/libforms.so.0.89 (0x40106000)
libm.so.6 => /lib/libm.so.6 (0x401d6000)
libc.so.6 => /lib/libc.so.6 (0x401f8000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x4031e000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
When I run it the form shortly pops up, the pixmap gets dumped into the
file (I get: "Done Writing /tmp/xx.ppm(PPM) 100%(100 of 100)") but on
flimage_free( ) it crashes with a segmentation fault. Here the backtrace
I get from gdb:
Program received signal SIGSEGV, Segmentation fault.
0x4026c96d in free () from /lib/libc.so.6
(gdb) bt
#0 0x4026c96d in free () from /lib/libc.so.6
#1 0x4025e663 in fclose@@GLIBC_2.1 () from /lib/libc.so.6
#2 0x40140d8d in flimage_close () from /usr/X11R6/lib/libforms.so.0.89
#3 0x401416f2 in flimage_free () from /usr/X11R6/lib/libforms.so.0.89
#4 0x08048a68 in main (argc=1, argv=0xbffff334) at flimage.c:41
#5 0x402157ee in __libc_start_main () from /lib/libc.so.6
As I already wrote this happens on a machine running Linux:
jens@dorimare:~/Programming/TESTS/flimage> uname -a
Linux dorimare 2.4.17 #17 Wed Feb 27 03:35:23 CET 2002 i686 unknown
The libc version I have is:
jens@dorimare:~/Programming/TESTS/flimage> /lib/libc.so.6
GNU C Library stable release version 2.2.4, by Roland McGrath et al.
Copyright (C) 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 2.95.3 20010315 (SuSE).
Compiled on a Linux 2.4.9 system on 2001-09-20.
Available extensions:
GNU libio by Per Bothner
crypt add-on version 2.1 by Michael Glad and others
Berkeley DB glibc 2.1 compat library by Thorsten Kukuk
linuxthreads-0.9 by Xavier Leroy
NoVersion patch for broken glibc 2.0 binaries
BIND-8.2.3-T5B
libthread_db work sponsored by Alpha Processor Inc
NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Report bugs using the `glibcbug' script to <bugs@gnu.org>.
Regards, Jens
--
_ _____ _____
| ||_ _||_ _| Jens.Toerring@physik.fu-berlin.de
_ | | | | | | AG Moebius, Institut fuer Molekuelphysik
| |_| | | | | | Fachbereich Physik, Freie Universitaet Berlin
\___/ens|_|homs|_|oerring Tel: ++49 (0)30 838 - 53394 / FAX: - 56046
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