1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <dlfcn.h>
18#include <errno.h>
19#include <stdio.h>
20#if __has_include(<sys/auxv.h>)
21#include <sys/auxv.h>
22#endif
23#include <unistd.h>
24
25extern int get_value_from_lib();
26
27int main() {
28  bool skip_vdso_check = false;
29#if __has_include(<sys/auxv.h>)
30  if (getauxval(AT_SYSINFO_EHDR) == 0) {
31    skip_vdso_check = true;
32  }
33#endif
34
35  if (!skip_vdso_check) {
36    const char* vdso_name = "linux-vdso.so.1";
37#if defined(__i386__)
38    vdso_name = "linux-gate.so.1";
39#endif
40    void* handle = dlopen(vdso_name, RTLD_NOW);
41    if (handle == nullptr) {
42      printf("%s", dlerror());
43      return 1;
44    }
45    dlclose(handle);
46  }
47
48  printf("%d", get_value_from_lib());
49  return 0;
50}
51