klibc/klibc/tests/malloctest2.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4
   5 #define NCYCLES 32768
   6 #define NSLOTS  4096
   7
   8 struct slot {
   9   char *ptr;
  10   size_t size;
  11 };
  12
  13 struct slot s[NSLOTS];
  14
  15 int main(void)
  16 {
  17   size_t sp, sq;
  18   char *p, *ep, *q, *eq;
  19   int r, i, j;
  20   int ok;
  21   int err = 0;
  22
  23   for ( r = 0 ; r < NCYCLES ; r++ ) {
  24     i = lrand48() % NSLOTS;
  25
  26     if ( s[i].ptr ) {
  27       free(s[i].ptr);
  28       printf("Freed     %8zu bytes at %p\n", s[i].size, s[i].ptr);
  29       s[i].ptr  = NULL;
  30       s[i].size = 0;
  31     } else {
  32       sp = lrand48();           /* 32-bit random number */
  33       sp >>= 12+(lrand48() % 20);
  34
  35       s[i].size = sp;
  36       s[i].ptr  = p = malloc(sp);
  37       ep = p+sp;
  38       ok = 1;
  39       for ( j = 0 ; j < NSLOTS ; j++ ) {
  40         q = s[j].ptr;
  41         if ( i != j && q ) {
  42           sq = s[j].size;
  43           eq = q+sq;
  44
  45           if ( (p < q && ep > q) || (p >= q && p < eq) ) {
  46             ok = 0;
  47             err = 1;
  48             break;
  49           }
  50         }
  51       }
  52       printf("Allocated %8zu bytes at %p, ok = %d\n", sp, p, ok);
  53
  54       if ( p )
  55         memset(p, 0xee, sp);    /* Poison this memory */
  56     }
  57   }
  58   return err;
  59 }
  60