Re: segmentation fault

[Olexiy Avramchenko <olexiy ctech cn ua>]

Aaron Yang wrote:
> hi, thanks for replying
>
> after changing, segmentation fault still follows.
>
> there's an additional error saying
> warning: passing arg 2 of `g_timeout_add' from
> incompatible pointer type
Use typecast: g_timeout_add (100, (GSourceFunc)real_draw, drawing_area);
compiler expects "gboolean (*GSourceFunc)(gpointer)" function.
> in this case arg 2 is static gint real_draw (
> GtkWidget * )
>
> i figure the error occurred because it shd be
>
> static gint real_draw ( gpointer )
>
> but still upon clicking the button,
> program terminates with segmentation error. what else
> could be the problem? thanks again for your help

Compile program with "-g" option - it will put debug info into the 
program. Use 'ulimit -c 100000' command to enable core dumping. Launch 
program, make the crash. Use 'gdb <program> <corefile>' command to run 
debugger. It will show backtrace and the line of code where program 
crashed. Use 'bt,'list','up','down' and 'print' commands to examine what 
happened:
bt - shows backtrace - the functions call chain;
list - shows the some lines of source, where program failed;
up/down - moves up and down on call chain;
print - smth like usual C printf - it can print local variables.

It's hard to tell what else can be wrong without sample that can be 
compiled and launched.

        Olexiy