Move base to DEPS

base/rand_util_posix.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/rand_util.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <unistd.h>
-
-#include "base/files/file_util.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-
-namespace {
-
-// We keep the file descriptor for /dev/urandom around so we don't need to
-// reopen it (which is expensive), and since we may not even be able to reopen
-// it if we are later put in a sandbox. This class wraps the file descriptor so
-// we can use LazyInstance to handle opening it on the first access.
-class URandomFd {
- public:
-  URandomFd() : fd_(open("/dev/urandom", O_RDONLY)) {
-    DCHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno;
-  }
-
-  ~URandomFd() { close(fd_); }
-
-  int fd() const { return fd_; }
-
- private:
-  const int fd_;
-};
-
-base::LazyInstance<URandomFd>::Leaky g_urandom_fd = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-namespace base {
-
-// NOTE: This function must be cryptographically secure. http://crbug.com/140076
-uint64 RandUint64() {
-  uint64 number;
-  RandBytes(&number, sizeof(number));
-  return number;
-}
-
-void RandBytes(void* output, size_t output_length) {
-  const int urandom_fd = g_urandom_fd.Pointer()->fd();
-  const bool success =
-      ReadFromFD(urandom_fd, static_cast<char*>(output), output_length);
-  CHECK(success);
-}
-
-int GetUrandomFD(void) {
-  return g_urandom_fd.Pointer()->fd();
-}
-
-}  // namespace base