heapfillfree

Fills the free blocks on the heap with a constant value.

Defined in header <alloc.h>

Syntax

#include <alloc.h>
int heapfillfree(unsigned int fillvalue);

Portability

Return value

The return value is less than zero for an error and greater than zero for success. The return values and their meaning is as follows:

See also

• farheapfillfree

Example

#include <stdio.h>
iinclude <alloc.h>
iinclude <mem.h>
idefine NUM_PTRS  10
tdefine NUM_BYTES 16

int main(void)
{
   char *array[ NUM_PTRS
   int i, res;
for( i = 0; i < NUM_PTRS;  i++ )
   array [ i ] = (char *) malloc( NUM_BYTES );
for( i = 0; i < NUM_PTRS;  i += 2 )
   free ( array[ i ] );
if( heapfillfree ( 1 ) < 0 ) {
   printf(  "Heap corrupted.\n" );
   return 1;
}
for( i = 1; i < NUM_PTRS;  i += 2 )
   memset( array [ i ], 0, NUM_BYTES );
res = heapcheckfree(  1 );
if( res < 0  )
   switch ( res ) {
      case _HEAPCORRUPT :
           printf(  "Heap corrupted.\n" );
           return 1;
      case _BADVALUE:
           printf(  "Bad value in free space.\n" );
           return 1;
      default:
           printf(  "Unknown error.\n" );
           return 1;
   }
printf( "Test successful. \n" );
return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

• Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/alloc.h/heapfillfree/ · short form /3.1/heapfillfree/