Line data    Source code

       1             : /*
       2             :     Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
       3             : 
       4             :     This file is part of libzmq, the ZeroMQ core engine in C++.
       5             : 
       6             :     libzmq is free software; you can redistribute it and/or modify it under
       7             :     the terms of the GNU Lesser General Public License (LGPL) as published
       8             :     by the Free Software Foundation; either version 3 of the License, or
       9             :     (at your option) any later version.
      10             : 
      11             :     As a special exception, the Contributors give you permission to link
      12             :     this library with independent modules to produce an executable,
      13             :     regardless of the license terms of these independent modules, and to
      14             :     copy and distribute the resulting executable under terms of your choice,
      15             :     provided that you also meet, for each linked independent module, the
      16             :     terms and conditions of the license of that module. An independent
      17             :     module is a module which is not derived from or based on this library.
      18             :     If you modify this library, you must extend this exception to your
      19             :     version of the library.
      20             : 
      21             :     libzmq is distributed in the hope that it will be useful, but WITHOUT
      22             :     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      23             :     FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
      24             :     License for more details.
      25             : 
      26             :     You should have received a copy of the GNU Lesser General Public License
      27             :     along with this program.  If not, see <http://www.gnu.org/licenses/>.
      28             : */
      29             : 
      30             : #include "precompiled.hpp"
      31             : #include <stdlib.h>
      32             : 
      33             : #include "platform.hpp"
      34             : #if defined ZMQ_HAVE_WINDOWS
      35             : #include "windows.hpp"
      36             : #else
      37             : #include <unistd.h>
      38             : #endif
      39             : 
      40             : #include "random.hpp"
      41             : #include "stdint.hpp"
      42             : #include "clock.hpp"
      43             : 
      44           0 : void zmq::seed_random ()
      45             : {
      46             : #if defined ZMQ_HAVE_WINDOWS
      47             :     int pid = (int) GetCurrentProcessId ();
      48             : #else
      49           0 :     int pid = (int) getpid ();
      50             : #endif
      51           0 :     srand ((unsigned int) (clock_t::now_us () + pid));
      52           0 : }
      53             : 
      54         717 : uint32_t zmq::generate_random ()
      55             : {
      56             :     //  Compensate for the fact that rand() returns signed integer.
      57         717 :     uint32_t low = (uint32_t) rand ();
      58         717 :     uint32_t high = (uint32_t) rand ();
      59         717 :     high <<= (sizeof (int) * 8 - 1);
      60         717 :     return high | low;
      61             : }
      62             :