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 <errno.h>
18 #include <stdio.h>
19 #include <unistd.h>
20 #include <sys/auxv.h>
21 
22 #include "libs_utils.h"
23 
24 static unsigned long g_AT_RANDOM;
25 static unsigned long g_AT_PAGESZ;
26 
preinit_ctor()27 static void preinit_ctor() {
28   g_AT_RANDOM = getauxval(AT_RANDOM);
29   g_AT_PAGESZ = getauxval(AT_PAGESZ);
30 }
31 
32 __attribute__((section(".preinit_array"), used)) void (*preinit_ctor_p)(void) = preinit_ctor;
33 
main()34 int main() {
35   // Did getauxval during preinit get the same results as getauxval now?
36   CHECK(getauxval(AT_RANDOM) == g_AT_RANDOM);
37   CHECK(getauxval(AT_PAGESZ) == g_AT_PAGESZ);
38   return 0;
39 }
40