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