Problem with pointer to external function

[leslie.polzer@gmx.net]

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Hello list,

why do it get the segfault below? What's wrong?


[sky@paktahn ~/code/cbtest]% cat main.c      
#include <stdio.h>

typedef void (*callback)();

extern callback cb;

int
main (int argc, char** argv)
{
        cb();

        return(0);
}

[sky@paktahn ~/code/cbtest]% cat defhandlers.c       
void cb()
{
}

[sky@paktahn ~/code/cbtest]% gcc main.c defhandlers.c -ggdb
[sky@paktahn ~/code/cbtest]% gdb ./a.out 
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) run
Starting program: /home/sky/code/cbtest/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x5de58955 in ?? ()
(gdb) bt full
#0  0x5de58955 in ?? ()
No symbol table info available.
#1  0x08048367 in main (argc=1, argv=0xbffff634) at main.c:10
No locals.
(gdb)


Regards,

Leslie

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