gdbserver_tests/watchpoints.c

   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 }