1// Check that free hook doesn't conflict with Realloc.
2// RUN: %clangxx_asan -O2 %s -o %t
3// RUN: %run %t 2>&1 | FileCheck %s
4
5// Malloc/free hooks are not supported on Windows.
6// XFAIL: win32
7
8#include <stdlib.h>
9#include <unistd.h>
10#include <sanitizer/allocator_interface.h>
11
12static void *glob_ptr;
13
14extern "C" {
15void __sanitizer_free_hook(const volatile void *ptr) {
16  if (ptr == glob_ptr) {
17    *(int*)ptr = 0;
18    write(1, "FreeHook\n", sizeof("FreeHook\n"));
19  }
20}
21}
22
23int main() {
24  int *x = (int*)malloc(100);
25  x[0] = 42;
26  glob_ptr = x;
27  int *y = (int*)realloc(x, 200);
28  // Verify that free hook was called and didn't spoil the memory.
29  if (y[0] != 42) {
30    _exit(1);
31  }
32  write(1, "Passed\n", sizeof("Passed\n"));
33  free(y);
34  // CHECK: FreeHook
35  // CHECK: Passed
36  return 0;
37}
38