libsanitizer/sanitizer_common/sanitizer_getauxval.h

   1 //===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Common getauxval() guards and definitions.
   9 // getauxval() is not defined until glibc version 2.16, or until API level 21
  10 // for Android.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef SANITIZER_GETAUXVAL_H
  15 #define SANITIZER_GETAUXVAL_H
  16
  17 #include "sanitizer_platform.h"
  18
  19 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
  20
  21 # include <features.h>
  22
  23 # ifndef __GLIBC_PREREQ
  24 #  define __GLIBC_PREREQ(x, y) 0
  25 # endif
  26
  27 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
  28      SANITIZER_FUCHSIA
  29 #  define SANITIZER_USE_GETAUXVAL 1
  30 # else
  31 #  define SANITIZER_USE_GETAUXVAL 0
  32 # endif
  33
  34 # if SANITIZER_USE_GETAUXVAL
  35 #  include <sys/auxv.h>
  36 # else
  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
  42 # endif
  43
  44 #endif // SANITIZER_LINUX || SANITIZER_FUCHSIA
  45
  46 #endif // SANITIZER_GETAUXVAL_H