// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "platform/globals.h"
#if defined(TARGET_OS_LINUX)

#include <errno.h>  // NOLINT
#include <fcntl.h>  // NOLINT

#include "bin/fdutils.h"
#include "bin/crypto.h"
#include "platform/signal_blocker.h"


namespace dart {
namespace bin {

bool Crypto::GetRandomBytes(intptr_t count, uint8_t* buffer) {
  ThreadSignalBlocker signal_blocker(SIGPROF);
  intptr_t fd = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
      open("/dev/urandom", O_RDONLY));
  if (fd < 0) return false;
  intptr_t bytes_read = 0;
  do {
    int res = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
        read(fd, buffer + bytes_read, count - bytes_read));
    if (res < 0) {
      int err = errno;
      VOID_TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(close(fd));
      errno = err;
      return false;
    }
    bytes_read += res;
  } while (bytes_read < count);
  VOID_TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(close(fd));
  return true;
}

}  // namespace bin
}  // namespace dart

#endif  // defined(TARGET_OS_LINUX)