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      1 #include <stdio.h>
      2 #include <unistd.h>
      3 
      4 #define MAX 20000
      5 
      6 int main () {
      7   int i;
      8   int inc_dec;
      9   int delta;
     10   int brk_stat;
     11 
     12   // loop to first increase, then decrease
     13   for (inc_dec = 1; inc_dec >= -1; inc_dec-=2) {
     14      // loop to increase(decrease) with small then big delta
     15      for (delta = 1; delta <= 400; delta+=399) {
     16         if (0) printf("initial brk value for inc_dec %d delta %d: %p\n",
     17                inc_dec, delta, sbrk(0));
     18         for (i=0; i<MAX; i++) {
     19            brk_stat = brk(sbrk(0) + inc_dec * delta);
     20            if (brk_stat == -1) {
     21               printf("brk value at failure: %p\n", sbrk(0));
     22               perror ("brk() failed!\n");
     23               return 0;
     24            }
     25         }
     26         if (0) printf("resulting brk value for inc_dec %d delta %d: %p\n",
     27                inc_dec, delta, sbrk(0));
     28      }
     29   }
     30 
     31   return 0;
     32 }
     33