components/nacl/loader/nonsfi/irt_random.cc

   1 // Copyright 2014 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.
   4
   5 #include <errno.h>
   6 #include <unistd.h>
   7
   8 #include "base/logging.h"
   9 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  10 #include "components/nacl/loader/nonsfi/irt_util.h"
  11
  12 namespace nacl {
  13 namespace nonsfi {
  14 namespace {
  15
  16 // FD for urandom.
  17 int secure_random_fd = -1;
  18
  19 int IrtGetRandomBytes(void* buf, size_t count, size_t* nread) {
  20   DCHECK_NE(secure_random_fd, -1);
  21   return CheckErrorWithResult(read(secure_random_fd, buf, count),
  22                               nread);
  23 }
  24
  25 }  // namespace
  26
  27 const nacl_irt_random kIrtRandom = {
  28   IrtGetRandomBytes
  29 };
  30
  31 void SetUrandomFd(int fd) {
  32   DCHECK_EQ(secure_random_fd, -1);
  33   secure_random_fd = fd;
  34 }
  35
  36 }  // namespace nonsfi
  37 }  // namespace nacl