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1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // Common getauxval() guards and definitions.
9 // getauxval() is not defined until glibc version 2.16, or until API level 21
12 //===----------------------------------------------------------------------===//
14 #ifndef SANITIZER_GETAUXVAL_H
15 #define SANITIZER_GETAUXVAL_H
17 #include "sanitizer_platform.h"
19 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
21 # include <features.h>
23 # ifndef __GLIBC_PREREQ
24 # define __GLIBC_PREREQ(x, y) 0
27 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
29 # define SANITIZER_USE_GETAUXVAL 1
31 # define SANITIZER_USE_GETAUXVAL 0
34 # if SANITIZER_USE_GETAUXVAL
35 # include <sys/auxv.h>
37 // The weak getauxval definition allows to check for the function at runtime.
38 // This is useful for Android, when compiled at a lower API level yet running
39 // on a more recent platform that offers the function.
40 extern "C" SANITIZER_WEAK_ATTRIBUTE
41 unsigned long getauxval(unsigned long type
); // NOLINT
44 #endif // SANITIZER_LINUX || SANITIZER_FUCHSIA
46 #endif // SANITIZER_GETAUXVAL_H