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#include <stdlib.h>
 
void func(void) {
  size_t resize = 1024;
  size_t alignment = 1 << 12;
  int *ptr;
  int *ptr1;

  if ((ptr = aligned_alloc(alignment , sizeof(int))) == NULL) {
    /* Handle error */
  }

/* ... */

if ((ptr1 = realloc(ptr, resize)) == NULL) {
    /* Handle error */
  }
}

#include <stdlib.h>
 
void func(void) {
  size_t resize = 1024;
  size_t alignment = 1 << 12;
  int *ptr;
  int *ptr1;

  if ((ptr = aligned_alloc(alignment, sizeof(int))) == NULL) {
    /* Handle error */
  }

/* ... */

if ((ptr1 = aligned_alloc(alignment, resize)) == NULL) {
    /* Handle error */
  }

  if ((memcpy(ptr1, ptr, sizeof(int)) == NULL) {
    /* Handle error */
  }

  free(ptr);
}

#include <malloc.h>
 
void func(void) {
  size_t alignment = 1 << 12;
  int *ptr;
  int *ptr1;

 
  // Original allocation
  if ((ptr = _aligned_malloc(sizeof(int), alignment)) == NULL) {
    /* Handle error */
  }
 
/* ... */
 
// Reallocation
  if ((ptr1 = _aligned_realloc(ptr, 1024, alignment)) == NULL) {
    _aligned_free(ptr);
    /* Handle error */
  }

  _aligned_free(ptr1);
}