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diff --git a/boost/uuid/detail/random_provider_posix.ipp b/boost/uuid/detail/random_provider_posix.ipp
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+++ b/boost/uuid/detail/random_provider_posix.ipp
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+/* boost uuid/detail/random_provider_posix implementation
+*
+* Copyright Jens Maurer 2000
+* Copyright 2007 Andy Tompkins.
+* Copyright Steven Watanabe 2010-2011
+* Copyright 2017 James E. King III
+*
+* Distributed under the Boost Software License, Version 1.0. (See
+* accompanying file LICENSE_1_0.txt or copy at
+* http://www.boost.org/LICENSE_1_0.txt)
+*
+* $Id$
+*/
+
+#include <boost/core/ignore_unused.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/uuid/entropy_error.hpp>
+#include <cerrno>
+#include <fcntl.h>    // open
+#include <sys/stat.h>
+#include <sys/types.h>
+#if defined(BOOST_HAS_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#ifndef BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_CLOSE
+#define BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_CLOSE ::close
+#endif
+#ifndef BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_OPEN
+#define BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_OPEN ::open
+#endif
+#ifndef BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_READ
+#define BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_READ ::read
+#endif
+
+namespace boost {
+namespace uuids {
+namespace detail {
+
+class random_provider_base
+{
+  public:
+    random_provider_base()
+      : fd_(0)
+    {
+        int flags = O_RDONLY;
+#if defined(O_CLOEXEC)
+        flags |= O_CLOEXEC;
+#endif
+        fd_ = BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_OPEN("/dev/urandom", flags);
+
+        if (-1 == fd_)
+        {
+            int err = errno;
+            BOOST_THROW_EXCEPTION(entropy_error(err, "open /dev/urandom"));
+        }
+    }
+
+    ~random_provider_base() BOOST_NOEXCEPT
+    {
+        if (fd_)
+        {
+            ignore_unused(BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_CLOSE(fd_));
+        }
+    }
+
+    //! Obtain entropy and place it into a memory location
+    //! \param[in]  buf  the location to write entropy
+    //! \param[in]  siz  the number of bytes to acquire
+    void get_random_bytes(void *buf, size_t siz)
+    {
+        size_t offset = 0;
+        do
+        {
+            ssize_t sz = BOOST_UUID_RANDOM_PROVIDER_POSIX_IMPL_READ(
+                fd_, static_cast<char *>(buf) + offset, siz - offset);
+
+            if (sz < 1)
+            {
+                int err = errno;
+                BOOST_THROW_EXCEPTION(entropy_error(err, "read"));
+            }
+
+            offset += sz;
+
+        } while (offset < siz);
+    }
+
+  private:
+    int fd_;
+};
+
+} // detail
+} // uuids
+} // boost