michael@0: // Copyright (c) 2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/rand_util.h"
michael@0: 
michael@0: #include <fcntl.h>
michael@0: #include <unistd.h>
michael@0: 
michael@0: #include "base/file_util.h"
michael@0: #include "base/logging.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: uint64_t RandUint64() {
michael@0:   uint64_t number;
michael@0: 
michael@0:   int urandom_fd = open("/dev/urandom", O_RDONLY);
michael@0:   CHECK(urandom_fd >= 0);
michael@0:   bool success = file_util::ReadFromFD(urandom_fd,
michael@0:                                        reinterpret_cast<char*>(&number),
michael@0:                                        sizeof(number));
michael@0:   CHECK(success);
michael@0:   close(urandom_fd);
michael@0: 
michael@0:   return number;
michael@0: }
michael@0: 
michael@0: }  // namespace base