text: // RUN: %clangxx %s -o %t && %run %t 2>&1 | FileCheck %s
  // UNSUPPORTED: android, ubsan
  
  #include <stdio.h>
  #include <stdlib.h>
  #if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 2)
  #include <mcheck.h>
  #else
  #define MCHECK_OK 0
  extern "C" int mcheck(void (*abortfunc)(int mstatus));
  extern "C" int mcheck_pedantic(void (*abortfunc)(int mstatus));
  extern "C" int mprobe(void *ptr);
  #endif
  
  void check_heap() {
    void *p = malloc(1000);
    int res = mprobe(p);
    if (res == MCHECK_OK)
      printf("Success!\n");
    free(p);
  }
  
  int main(int argc, char *argv[]) {
    void *p;
    if (mcheck(NULL) != 0) {
      fprintf(stderr, "mcheck() failed\n");
      exit(EXIT_FAILURE);
    }
  
    check_heap();
    // CHECK: Success!
  
    if (mcheck_pedantic(NULL) != 0) {
      fprintf(stderr, "mcheck_pedantic() failed\n");
      exit(EXIT_FAILURE);
    }
  
    check_heap();
    // CHECK: Success!
  
    return 0;
  }
  