Syntax
#include <umalloc.h> int _uheapchk(Heap_t heap);Description
_uheapchk works just like _heapchk, except that you specify the heap to check; _heapchk always checks the default heap.
Note: Using the _uheapchk, _uheapset, and _uheap_walk functions (and their equivalents for the default heap) may add overhead to each object allocated from the heap.
This example creates a heap and performs memory operations on it. It then calls _uheapchk to validate the heap.
#include <stdlib.h>#include <stdio.h>
#include <umalloc.h>
int main(void)
{
Heap_t myheap;
char *ptr;
int rc;
/* Use default heap as user heap */
myheap = _udefault(NULL);
if (NULL == (ptr = _ucalloc(myheap, 100, 1))) {
puts("Cannot allocate memory from user heap.");
exit(EXIT_FAILURE);
}
*(ptr - 1) = 'x'; /* overwrite storage that was not allocated */
if (_HEAPOK != (rc = _uheapchk(myheap))) {
switch(rc) {
case _HEAPEMPTY:
puts("The heap has not been initialized.");
break;
case _HEAPBADNODE:
puts("A memory node is corrupted or the heap is damaged.");
break;
case _HEAPBADBEGIN:
puts("The heap specified is not valid.");
break;
}
exit(rc);
}
free(ptr);
return 0;
/****************************************************************************
The output should be similar to :
A memory node is corrupted or the heap is damaged.
****************************************************************************/
}
Related Information