1 #include <stdlib.h> 2 #include <stdio.h> 3 #include <string.h> 4 5 static void breakme(int line) 6 { 7 fprintf(stderr, "breakme function called from line %d\n", line); 8 fflush(stderr); 9 } 10 static char undefined[10] = "undefined"; 11 int main (int argc, char *argv[]) 12 { 13 14 /* we will test 15 read watchpoint at 0, 16 read/write watchpoints at 4 17 write watchpoints at 8 */ 18 19 breakme(__LINE__); //break1 20 21 /* We verify read watchpoints are triggered at 0 and 4, not at 8 */ 22 fprintf(stderr, "before reading 0/4/8\n"); 23 if (undefined[0] == 'u') 24 fprintf(stderr, "u: Expected value at 0\n"); 25 else 26 fprintf(stderr, "u: Unexpected value at 0\n"); 27 28 if (undefined[4] == 'f') 29 fprintf(stderr, "f: Expected value at 4\n"); 30 else 31 fprintf(stderr, "f: Unexpected value at 4\n"); 32 33 if (undefined[8] == 'd') 34 fprintf(stderr, "d: Expected value at 8\n"); 35 else 36 fprintf(stderr, "d: Unexpected value at 8\n"); 37 38 39 /* We verify write watchpoints are triggered at 4 and 8, not at 0 */ 40 fprintf(stderr, "before writing 0\n"); 41 undefined[0] = 'U'; 42 43 fprintf(stderr, "before writing 4\n"); 44 undefined[4] = 'F'; 45 46 fprintf(stderr, "before writing 8\n"); 47 undefined[8] = 'D'; 48 49 fprintf(stderr, "after writing 8\n"); 50 51 /* after having remove the watchpoints, check we can read and write 52 without break. */ 53 fprintf(stderr, "value %s\n", undefined); 54 55 fprintf(stderr, "before rewriting 0\n"); 56 undefined[0] = '0'; 57 58 fprintf(stderr, "before rewriting 4\n"); 59 undefined[4] = '4'; 60 61 fprintf(stderr, "before rewriting 8\n"); 62 undefined[8] = '8'; 63 64 fprintf(stderr, "value %s\n", undefined); 65 66 { 67 char *k50 = malloc(50000); 68 memset (k50, 'p', 50000); 69 fprintf(stderr, "value of k50[1000] %c\n", k50[1000]); 70 free(k50); //break2 71 } 72 73 exit(0); 74 } 75
