1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Common getauxval() guards and definitions.
11 // getauxval() is not defined until glibc version 2.16, or until API level 21
14 //===----------------------------------------------------------------------===//
16 #ifndef SANITIZER_GETAUXVAL_H
17 #define SANITIZER_GETAUXVAL_H
19 #include "sanitizer_platform.h"
21 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
23 # include <features.h>
25 # ifndef __GLIBC_PREREQ
26 # define __GLIBC_PREREQ(x, y) 0
29 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
31 # define SANITIZER_USE_GETAUXVAL 1
33 # define SANITIZER_USE_GETAUXVAL 0
36 # if SANITIZER_USE_GETAUXVAL
37 # include <sys/auxv.h>
39 // The weak getauxval definition allows to check for the function at runtime.
40 // This is useful for Android, when compiled at a lower API level yet running
41 // on a more recent platform that offers the function.
42 extern "C" SANITIZER_WEAK_ATTRIBUTE
43 unsigned long getauxval(unsigned long type); // NOLINT
46 #endif // SANITIZER_LINUX || SANITIZER_FUCHSIA
48 #endif // SANITIZER_GETAUXVAL_H