1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Common getauxval() guards and definitions. 11 // getauxval() is not defined until glibc version 2.16, or until API level 21 12 // for Android. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef SANITIZER_GETAUXVAL_H 17 #define SANITIZER_GETAUXVAL_H 18 19 #include "sanitizer_platform.h" 20 21 #if SANITIZER_LINUX || SANITIZER_FUCHSIA 22 23 # include <features.h> 24 25 # ifndef __GLIBC_PREREQ 26 # define __GLIBC_PREREQ(x, y) 0 27 # endif 28 29 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \ 30 SANITIZER_FUCHSIA 31 # define SANITIZER_USE_GETAUXVAL 1 32 # else 33 # define SANITIZER_USE_GETAUXVAL 0 34 # endif 35 36 # if SANITIZER_USE_GETAUXVAL 37 # include <sys/auxv.h> 38 # else 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 44 # endif 45 46 #endif // SANITIZER_LINUX || SANITIZER_FUCHSIA 47 48 #endif // SANITIZER_GETAUXVAL_H 49
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