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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <unistd.h>
#endif
#include "random.hpp"
#include "stdint.hpp"
#include "clock.hpp"
void zmq::seed_random ()
{
#if defined ZMQ_HAVE_WINDOWS
int pid = (int) GetCurrentProcessId ();
#else
int pid = (int) getpid ();
#endif
srand ((unsigned int) (clock_t::now_us () + pid));
}
uint32_t zmq::generate_random ()
{
// Compensate for the fact that rand() returns signed integer.
uint32_t low = (uint32_t) rand ();
uint32_t high = (uint32_t) rand ();
high <<= (sizeof (int) * 8 - 1);
return high | low;
}
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