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
