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//===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common getauxval() guards and definitions.
// getauxval() is not defined until glibc version 2.16, or until API level 21
// for Android.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_GETAUXVAL_H
#define SANITIZER_GETAUXVAL_H
#include "sanitizer_platform.h"
#if SANITIZER_LINUX || SANITIZER_FUCHSIA
# include <features.h>
# ifndef __GLIBC_PREREQ
# define __GLIBC_PREREQ(x, y) 0
# endif
# if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
SANITIZER_FUCHSIA
# define SANITIZER_USE_GETAUXVAL 1
# else
# define SANITIZER_USE_GETAUXVAL 0
# endif
# if SANITIZER_USE_GETAUXVAL
# include <sys/auxv.h>
# else
// The weak getauxval definition allows to check for the function at runtime.
// This is useful for Android, when compiled at a lower API level yet running
// on a more recent platform that offers the function.
extern "C" SANITIZER_WEAK_ATTRIBUTE
unsigned long getauxval(unsigned long type); // NOLINT
# endif
#endif // SANITIZER_LINUX || SANITIZER_FUCHSIA
#endif // SANITIZER_GETAUXVAL_H
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