1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Common getauxval() guards and definitions. 10 // getauxval() is not defined until glibc version 2.16, or until API level 21 11 // for Android. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef SANITIZER_GETAUXVAL_H 16 #define SANITIZER_GETAUXVAL_H 17 18 #include "sanitizer_platform.h" 19 20 #if SANITIZER_LINUX || SANITIZER_FUCHSIA 21 22 # include <features.h> 23 24 # ifndef __GLIBC_PREREQ 25 # define __GLIBC_PREREQ(x, y) 0 26 # endif 27 28 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \ 29 SANITIZER_FUCHSIA 30 # define SANITIZER_USE_GETAUXVAL 1 31 # else 32 # define SANITIZER_USE_GETAUXVAL 0 33 # endif 34 35 # if SANITIZER_USE_GETAUXVAL 36 # include <sys/auxv.h> 37 # else 38 // The weak getauxval definition allows to check for the function at runtime. 39 // This is useful for Android, when compiled at a lower API level yet running 40 // on a more recent platform that offers the function. 41 extern "C" SANITIZER_WEAK_ATTRIBUTE 42 unsigned long getauxval(unsigned long type); // NOLINT 43 # endif 44 45 #endif // SANITIZER_LINUX || SANITIZER_FUCHSIA 46 47 #endif // SANITIZER_GETAUXVAL_H 48