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da31917f4f
Relicense permission collected from all relevant authors as tallied at: https://github.com/rlenferink/libzmq-relicense/blob/master/checklist.md The relicense grants are collected under RELICENSE/ and will be moved to the above repository in a later commit. Fixes https://github.com/zeromq/libzmq/issues/2376
68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
/* SPDX-License-Identifier: MPL-2.0 */
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#include "precompiled.hpp"
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#include <stdlib.h>
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#if !defined ZMQ_HAVE_WINDOWS
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#include <unistd.h>
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#endif
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#include "random.hpp"
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#include "stdint.hpp"
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#include "clock.hpp"
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#include "mutex.hpp"
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#include "macros.hpp"
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#if defined(ZMQ_USE_LIBSODIUM)
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#include "sodium.h"
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#endif
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void zmq::seed_random ()
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{
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#if defined ZMQ_HAVE_WINDOWS
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const int pid = static_cast<int> (GetCurrentProcessId ());
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#else
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int pid = static_cast<int> (getpid ());
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#endif
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srand (static_cast<unsigned int> (clock_t::now_us () + pid));
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}
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uint32_t zmq::generate_random ()
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{
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// Compensate for the fact that rand() returns signed integer.
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const uint32_t low = static_cast<uint32_t> (rand ());
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uint32_t high = static_cast<uint32_t> (rand ());
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high <<= (sizeof (int) * 8 - 1);
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return high | low;
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}
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static void manage_random (bool init_)
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{
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#if defined(ZMQ_USE_LIBSODIUM)
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if (init_) {
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// sodium_init() is now documented as thread-safe in recent versions
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int rc = sodium_init ();
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zmq_assert (rc != -1);
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#if defined(ZMQ_LIBSODIUM_RANDOMBYTES_CLOSE)
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} else {
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// randombytes_close either a no-op or not threadsafe
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// doing this without refcounting can cause crashes
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// if called while a context is active
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randombytes_close ();
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#endif
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}
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#else
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LIBZMQ_UNUSED (init_);
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#endif
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}
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void zmq::random_open ()
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{
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manage_random (true);
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}
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void zmq::random_close ()
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{
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manage_random (false);
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}
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