_heapchk

Статья
10/16/2008

Runs consistency checks on the heap.

int _heapchk( void );

Возвращаемое значение

_heapchk returns one of the following integer manifest constants defined in Malloc.h.

_HEAPBADBEGIN
Initial header information is bad or cannot be found.
_HEAPBADNODE
Bad node has been found or heap is damaged.
_HEAPBADPTR
Pointer into heap is not valid.
_HEAPEMPTY
Heap has not been initialized.
_HEAPOK
Heap appears to be consistent.

In addition, if an error occurs, _heapchk sets errno to ENOSYS.

Заметки

The _heapchk function helps debug heap-related problems by checking for minimal consistency of the heap. If the operating system does not support _heapchk(for example, Windows 98), the function returns _HEAPOK and sets errno to ENOSYS.

Требования

Routine	Required header	Optional header
_heapchk	<malloc.h>	<errno.h>

For more compatibility information, see Compatibility in the Introduction.

Пример

// crt_heapchk.c
// This program checks the heap for
// consistency and prints an appropriate message.
 
#include <malloc.h>
#include <stdio.h>

int main( void )
{
   int  heapstatus;
   char *buffer;

   // Allocate and deallocate some memory
   if( (buffer = (char *)malloc( 100 )) != NULL )
      free( buffer );

   // Check heap status
   heapstatus = _heapchk();
   switch( heapstatus )
   {
   case _HEAPOK:
      printf(" OK - heap is fine\n" );
      break;
   case _HEAPEMPTY:
      printf(" OK - heap is empty\n" );
      break;
   case _HEAPBADBEGIN:
      printf( "ERROR - bad start of heap\n" );
      break;
   case _HEAPBADNODE:
      printf( "ERROR - bad node in heap\n" );
      break;
   }
}