Page History

#include <stdlib.h>
#include <stdio.h>

int main(void) {
  size_t size = 8;
  size_t re-size = 101024;
  size_t align = 1 << 12;
  float *ptr;
  double *ptr1;

if(posix_memalign((void **)&ptr, align , 8size) != 0) {
  exit(0);
}

ptr[0] = 12.5;
ptr[1] = 25.5;

printf("memory aligned to %d bytes\n\n",align);
printf("ptr[0]   : %p = %f\n",ptr, ptr[0]);
printf("ptr[1]   : %p = %f\n\n",&ptr[1], ptr[1]);

if((ptr1 = realloc((int *)ptr, 1024re-size)) == NULL) {
exit(0);
}

printf("After realloc(): \n");
printf("ptr1[0]   : %p = %lf\n",ptr1, ptr[0]);
printf("ptr1[1]  : %p = %lf\n\n",&ptr1[1], ptr1[1]);

free(ptr1);
return 0;
}

memory aligned to 4096 bytes

ptr[0]   : 0xb43c0000x39bf000 = 12.500000
ptr[1]   : 0xb43c0040x39bf004 = 25.500000

After realloc():
ptr1[0]   : 0xb43c0000x39be010 = 120.500000000000
ptr1[1]  : 0xb43c0080x39be018 = 0.000000