[Mingw-users] Walking the malloc pool

[<mi...@ca...>]

Hello!

I want to list all memory buffers that are either allocated or free by using the functions in malloc.h.

However, this doesnt give me anything:

void heapdump()
{
   _HEAPINFO hinfo;
   int heapstatus;
   hinfo._pentry = NULL;
   while( ( heapstatus = _heapwalk( &hinfo ) ) == 0 )
   { printf( "%6s block at %Fp of size %4.4X\n",
        ( hinfo._useflag == _USEDENTRY ? "USED" : "FREE" ),
          hinfo._pentry, hinfo._size );
   }
   printf("heap status: %d\n",heapstatus);

/*
   switch( heapstatus )
   {
   case _HEAPEMPTY:
      printf( "OK - empty heap\n" );
      break;
   case _HEAPEND:
      printf( "OK - end of heap\n" );
      break;
   case _HEAPBADPTR:
      printf( "ERROR - bad pointer to heap\n" );
      break;
   case _HEAPBADBEGIN:
      printf( "ERROR - bad start of heap\n" );
      break;
   case _HEAPBADNODE:
      printf( "ERROR - bad node in heap\n" );
      break;
   }
*/
}


I was commenting out some stuff because malloc.h didnt define those macros. (why not?).
However, the big problem is that _heapwalk returns -2 constantly. I got this code from:

http://groups.google.com/groups?q=heapstatus+_heapwalk&hl=en&lr=&ie=UTF-8&selm=32B7552B.11FD%40deltanet.com&rnum=3

And changed _HEAPOK to 0, because _HEAPOK isnt defined in the mingw headers.

Someone, help me!

:)

/Anders Lindén