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1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/rand_util.h" | 5 #include "base/rand_util.h" |
6 #include "base/rand_util_c.h" | 6 #include "base/rand_util_c.h" |
7 | 7 |
8 #include <errno.h> | 8 #include <errno.h> |
9 #include <fcntl.h> | 9 #include <fcntl.h> |
10 #include <unistd.h> | 10 #include <unistd.h> |
11 | 11 |
12 #include "base/file_util.h" | 12 #include "base/file_util.h" |
13 #include "base/lazy_instance.h" | 13 #include "base/lazy_instance.h" |
14 #include "base/logging.h" | 14 #include "base/logging.h" |
15 | 15 |
16 namespace { | 16 namespace { |
17 | 17 |
18 // We keep the file descriptor for /dev/urandom around so we don't need to | 18 // We keep the file descriptor for /dev/urandom around so we don't need to |
19 // reopen it (which is expensive), and since we may not even be able to reopen | 19 // reopen it (which is expensive), and since we may not even be able to reopen |
20 // it if we are later put in a sandbox. This class wraps the file descriptor so | 20 // it if we are later put in a sandbox. This class wraps the file descriptor so |
21 // we can use LazyInstance to handle opening it on the first access. | 21 // we can use LazyInstance to handle opening it on the first access. |
22 class URandomFd { | 22 class URandomFd { |
23 public: | 23 public: |
24 URandomFd() { | 24 URandomFd() { |
25 fd_ = open("/dev/urandom", O_RDONLY); | 25 fd_ = open("/dev/urandom", O_RDONLY); |
26 CHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno; | 26 DCHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno; |
27 } | 27 } |
28 | 28 |
29 ~URandomFd() { | 29 ~URandomFd() { |
30 close(fd_); | 30 close(fd_); |
31 } | 31 } |
32 | 32 |
33 int fd() const { return fd_; } | 33 int fd() const { return fd_; } |
34 | 34 |
35 private: | 35 private: |
36 int fd_; | 36 int fd_; |
(...skipping 15 matching lines...) Expand all Loading... |
52 CHECK(success); | 52 CHECK(success); |
53 | 53 |
54 return number; | 54 return number; |
55 } | 55 } |
56 | 56 |
57 } // namespace base | 57 } // namespace base |
58 | 58 |
59 int GetUrandomFD(void) { | 59 int GetUrandomFD(void) { |
60 return g_urandom_fd.Pointer()->fd(); | 60 return g_urandom_fd.Pointer()->fd(); |
61 } | 61 } |
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