Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : // Copyright (c) 2008 The Chromium Authors. All rights reserved.
       4             : // Use of this source code is governed by a BSD-style license that can be
       5             : // found in the LICENSE file.
       6             : 
       7             : #include "base/rand_util.h"
       8             : 
       9             : #include <fcntl.h>
      10             : #include <unistd.h>
      11             : 
      12             : #include "base/file_util.h"
      13             : #include "base/logging.h"
      14             : 
      15             : namespace base {
      16             : 
      17          15 : uint64_t RandUint64() {
      18             :   uint64_t number;
      19             : 
      20          15 :   int urandom_fd = open("/dev/urandom", O_RDONLY);
      21          15 :   CHECK(urandom_fd >= 0);
      22             :   bool success = file_util::ReadFromFD(urandom_fd,
      23             :                                        reinterpret_cast<char*>(&number),
      24          15 :                                        sizeof(number));
      25          15 :   CHECK(success);
      26          15 :   close(urandom_fd);
      27             : 
      28          15 :   return number;
      29             : }
      30             : 
      31             : }  // namespace base