Hi monks,

There is section called "Fiddling with the Perl stack from your C program" in perlembed. In it there is a perl code for integer exponentiation which is called from C function. Actually that code works pretty fine.
My doubt is that when i just added use DBI; to the perl code and exectuted the C code i am getting error
free(): invalid pointer 0x804c6b8!
How could i avoid it. I am also getting this error in some other programs also. The C code and perl code are given below

#include <EXTERN.h>
#include <perl.h>

static PerlInterpreter *my_perl;
EXTERN_C void boot_DynaLoader (pTHX_ CV* cv);

EXTERN_C void
xs_init(pTHX)
{
        char *file = __FILE__;
        dXSUB_SYS;

        /* DynaLoader is a special case */
        newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
}

static void PerlPower(int a, int b)
{
  dSP;
  ENTER;
  SAVETMPS;
  PUSHMARK(SP);
  XPUSHs(sv_2mortal(newSViv(a)));
  XPUSHs(sv_2mortal(newSViv(b)));
  PUTBACK;
  call_pv("expo", G_SCALAR);
  SPAGAIN;
  printf ("%d\n", POPi);
  PUTBACK;
  FREETMPS;
  LEAVE;
}
int main (int argc, char **argv, char **env)
{
  char *my_argv[] = { "", "power.pl" };
  
  my_perl = perl_alloc();
  perl_construct( my_perl );

  perl_parse(my_perl, xs_init, 2, my_argv, (char **)NULL);
  perl_run(my_perl);
  PerlPower(3, 4);

  perl_destruct(my_perl);
  perl_free(my_perl);
}
[download]

PERL FILE

use DBI;

sub expo {
    my ($a, $b) = @_;
    return $a ** $b;
}
[download]

You could ask what is the use of "use DBI" ? The reason is i am getting this error in some other files also and also out of curiosity.Could any one find the reason for the error message

Thanks
Kiran