boost/uuid/detail/random_provider_detect_platform.hpp
// // Copyright (c) 2017 James E. King III // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // https://www.boost.org/LICENSE_1_0.txt) // // Platform-specific random entropy provider platform detection // #ifndef BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP #define BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP #include <boost/predef/library/c/cloudabi.h> #include <boost/predef/library/c/gnu.h> #include <boost/predef/os/bsd/open.h> #include <boost/predef/os/windows.h> // Note: Don't use Boost.Predef to detect Linux and Android as it may give different results depending on header inclusion order. // https://github.com/boostorg/predef/issues/81#issuecomment-413329061 #if (defined(__linux__) || defined(__linux) || defined(linux)) && (!defined(__ANDROID__) || __ANDROID_API__ >= 28) #include <sys/syscall.h> #if defined(SYS_getrandom) #define BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM #endif // defined(SYS_getrandom) #endif // On Linux, getentropy is implemented via getrandom. If we know that getrandom is not supported by the kernel, getentropy // will certainly not work, even if libc provides a wrapper function for it. There is no reason, ever, to use getentropy on that platform. #if !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY) && (defined(__linux__) || defined(__linux) || defined(linux) || defined(__ANDROID__)) #define BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY #endif // // Platform Detection - will load in the correct header and // will define the class <tt>random_provider_base</tt>. // #if BOOST_OS_BSD_OPEN >= BOOST_VERSION_NUMBER(2, 1, 0) || BOOST_LIB_C_CLOUDABI # define BOOST_UUID_RANDOM_PROVIDER_ARC4RANDOM # define BOOST_UUID_RANDOM_PROVIDER_NAME arc4random #elif BOOST_OS_WINDOWS # include <boost/winapi/config.hpp> # if BOOST_WINAPI_PARTITION_APP_SYSTEM && \ !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_WINCRYPT) && \ !defined(_WIN32_WCE) && \ (BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6) # define BOOST_UUID_RANDOM_PROVIDER_BCRYPT # define BOOST_UUID_RANDOM_PROVIDER_NAME bcrypt # elif BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM # define BOOST_UUID_RANDOM_PROVIDER_WINCRYPT # define BOOST_UUID_RANDOM_PROVIDER_NAME wincrypt # else # error Unable to find a suitable windows entropy provider # endif #elif defined(BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM) && !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX) && !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETRANDOM) # define BOOST_UUID_RANDOM_PROVIDER_GETRANDOM # define BOOST_UUID_RANDOM_PROVIDER_NAME getrandom #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) # define BOOST_UUID_RANDOM_PROVIDER_GETENTROPY # define BOOST_UUID_RANDOM_PROVIDER_NAME getentropy #else # define BOOST_UUID_RANDOM_PROVIDER_POSIX # define BOOST_UUID_RANDOM_PROVIDER_NAME posix #endif #define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X) #X #define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(X) BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X) #if defined(BOOST_UUID_RANDOM_PROVIDER_SHOW) #pragma message("BOOST_UUID_RANDOM_PROVIDER_NAME " BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(BOOST_UUID_RANDOM_PROVIDER_NAME)) #endif #endif // BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP