ceph/src/boost/boost/uuid/detail/random_provider_detect_platform.hpp

   1 //
   2 // Copyright (c) 2017 James E. King III
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt or copy at
   6 //   https://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // Platform-specific random entropy provider platform detection
   9 //
  10
  11 #ifndef BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP
  12 #define BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP
  13
  14 #include <boost/predef/library/c/cloudabi.h>
  15 #include <boost/predef/library/c/gnu.h>
  16 #include <boost/predef/os/bsd/open.h>
  17 #include <boost/predef/os/windows.h>
  18
  19 // Note: Don't use Boost.Predef to detect Linux and Android as it may give different results depending on header inclusion order.
  20 // https://github.com/boostorg/predef/issues/81#issuecomment-413329061
  21 #if (defined(__linux__) || defined(__linux) || defined(linux)) && (!defined(__ANDROID__) || __ANDROID_API__ >= 28)
  22 #include <sys/syscall.h>
  23 #if defined(SYS_getrandom)
  24 #define BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM
  25 #endif // defined(SYS_getrandom)
  26 #endif
  27
  28 // On Linux, getentropy is implemented via getrandom. If we know that getrandom is not supported by the kernel, getentropy
  29 // will certainly not work, even if libc provides a wrapper function for it. There is no reason, ever, to use getentropy on that platform.
  30 #if !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY) && (defined(__linux__) || defined(__linux) || defined(linux) || defined(__ANDROID__))
  31 #define BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY
  32 #endif
  33
  34 //
  35 // Platform Detection - will load in the correct header and
  36 // will define the class <tt>random_provider_base</tt>.
  37 //
  38
  39 #if BOOST_OS_BSD_OPEN >= BOOST_VERSION_NUMBER(2, 1, 0) || BOOST_LIB_C_CLOUDABI
  40 # define BOOST_UUID_RANDOM_PROVIDER_ARC4RANDOM
  41 # define BOOST_UUID_RANDOM_PROVIDER_NAME arc4random
  42
  43 #elif BOOST_OS_WINDOWS
  44 # include <boost/winapi/config.hpp>
  45 # if BOOST_WINAPI_PARTITION_APP_SYSTEM && \
  46      !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_WINCRYPT) && \
  47      !defined(_WIN32_WCE) && \
  48      (BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6)
  49 #  define BOOST_UUID_RANDOM_PROVIDER_BCRYPT
  50 #  define BOOST_UUID_RANDOM_PROVIDER_NAME bcrypt
  51
  52 # elif BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
  53 #  define BOOST_UUID_RANDOM_PROVIDER_WINCRYPT
  54 #  define BOOST_UUID_RANDOM_PROVIDER_NAME wincrypt
  55 # else
  56 #  error Unable to find a suitable windows entropy provider
  57 # endif
  58
  59 #elif defined(BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM) && !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX) && !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETRANDOM)
  60 # define BOOST_UUID_RANDOM_PROVIDER_GETRANDOM
  61 # define BOOST_UUID_RANDOM_PROVIDER_NAME getrandom
  62
  63 #elif BOOST_LIB_C_GNU >= BOOST_VERSION_NUMBER(2, 25, 0) && !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX) && !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY)
  64 # define BOOST_UUID_RANDOM_PROVIDER_GETENTROPY
  65 # define BOOST_UUID_RANDOM_PROVIDER_NAME getentropy
  66
  67 #else
  68 # define BOOST_UUID_RANDOM_PROVIDER_POSIX
  69 # define BOOST_UUID_RANDOM_PROVIDER_NAME posix
  70
  71 #endif
  72
  73 #define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X) #X
  74 #define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(X) BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X)
  75
  76 #if defined(BOOST_UUID_RANDOM_PROVIDER_SHOW)
  77 #pragma message("BOOST_UUID_RANDOM_PROVIDER_NAME " BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(BOOST_UUID_RANDOM_PROVIDER_NAME))
  78 #endif
  79
  80 #endif // BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP