The Tor Browser: ipc/chromium/src/base/rand_util

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 // Copyright (c) 2008 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/rand_util.h"

     7 #include <fcntl.h>

     8 #include <unistd.h>

    10 #include "base/file_util.h"

    11 #include "base/logging.h"

    13 namespace base {

    15 uint64_t RandUint64() {

    16   uint64_t number;

    18   int urandom_fd = open("/dev/urandom", O_RDONLY);

    19   CHECK(urandom_fd >= 0);

    20   bool success = file_util::ReadFromFD(urandom_fd,

    21                                        reinterpret_cast<char*>(&number),

    22                                        sizeof(number));

    23   CHECK(success);

    24   close(urandom_fd);

    26   return number;

    27 }

    29 }  // namespace base

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