sal/osl/unx/random.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include "system.hxx"
  11 #include <oslrandom.h>
  12
  13 #include <assert.h>
  14
  15 int osl_get_system_random_data(char* buffer, size_t desired_len)
  16 {
  17     int fd;
  18
  19     assert(buffer);
  20     fd = open("/dev/urandom", O_RDONLY);
  21     if (fd != -1)
  22     {
  23         while (desired_len)
  24         {
  25             ssize_t nb_read;
  26             if ((nb_read = read(fd, buffer, desired_len)) == -1)
  27             {
  28                 if (errno != EINTR)
  29                 {
  30                     close(fd);
  31                     return false;
  32                 }
  33             }
  34             else
  35             {
  36                 buffer += nb_read;
  37                 desired_len -= nb_read;
  38             }
  39         }
  40         close(fd);
  41         return true;
  42     }
  43     return false;
  44 }
  45
  46 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */