1// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5#include "platform/globals.h"
6#if defined(HOST_OS_LINUX)
7
8#include <errno.h> // NOLINT
9#include <fcntl.h> // NOLINT
10
11#include "bin/crypto.h"
12#include "bin/fdutils.h"
13#include "platform/signal_blocker.h"
14
15namespace dart {
16namespace bin {
17
18bool Crypto::GetRandomBytes(intptr_t count, uint8_t* buffer) {
19 ThreadSignalBlocker signal_blocker(SIGPROF);
20 intptr_t fd = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
21 open("/dev/urandom", O_RDONLY | O_CLOEXEC));
22 if (fd < 0) {
23 return false;
24 }
25 intptr_t bytes_read = 0;
26 do {
27 int res = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
28 read(fd, buffer + bytes_read, count - bytes_read));
29 if (res < 0) {
30 int err = errno;
31 close(fd);
32 errno = err;
33 return false;
34 }
35 bytes_read += res;
36 } while (bytes_read < count);
37 close(fd);
38 return true;
39}
40
41} // namespace bin
42} // namespace dart
43
44#endif // defined(HOST_OS_LINUX)
45