ceph/src/boost/boost/uuid/detail/random_provider_getentropy.ipp

   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 // getentropy() capable platforms
   9 //
  10
  11 #include <boost/config.hpp>
  12 #include <boost/throw_exception.hpp>
  13 #include <cerrno>
  14 #include <cstddef>
  15 #include <unistd.h>
  16
  17 namespace boost {
  18 namespace uuids {
  19 namespace detail {
  20
  21 class random_provider_base
  22 {
  23 public:
  24     //! Obtain entropy and place it into a memory location
  25     //! \param[in]  buf  the location to write entropy
  26     //! \param[in]  siz  the number of bytes to acquire
  27     void get_random_bytes(void *buf, std::size_t siz)
  28     {
  29         int res = getentropy(buf, siz);
  30         if (BOOST_UNLIKELY(-1 == res))
  31         {
  32             int err = errno;
  33             BOOST_THROW_EXCEPTION(entropy_error(err, "getentropy"));
  34         }
  35     }
  36 };
  37
  38 } // detail
  39 } // uuids
  40 } // boost