memcheck/tests/resvn_stack.c

   1 #include <stdio.h>
   2
   3 __attribute__((noinline)) void big(void)
   4 {
   5    /* The below ensures the stack grows a lot. However, we hope the stack
   6       extension is not done yet, as no memory has been read/written. */
   7    volatile char c[200000];
   8
   9    /* Access only the higher part of the stack, to avoid mapping SP */
  10    /* The below 2 printfs should produce deterministic output, whatever
  11       the random value of c[]. */
  12    if (c[200000 - 1])
  13       fprintf(stderr, "Accessing fresh %s\n", "stack");
  14    else
  15       fprintf(stderr, "Accessing %s stack\n", "fresh");
  16
  17 }
  18
  19 int main(void )
  20 {
  21    big();
  22    return 0;
  23 }