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