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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#ifdef __unix__
// Verifies that IDs don't clash after forking the process.
//
// See https://github.com/opentracing-contrib/nginx-opentracing/issues/52
# include "src/common/random.h"
# include <sys/mman.h>
# include <sys/types.h>
# include <sys/wait.h>
# include <unistd.h>
# include <cstdio>
# include <cstdlib>
# include <iostream>
using opentelemetry::sdk::common::Random;
static uint64_t *child_id;
int main()
{
// Set up shared memory to communicate between parent and child processes.
//
// See https://stackoverflow.com/a/13274800/4447365
child_id = static_cast<uint64_t *>(
mmap(nullptr, sizeof(*child_id), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0));
*child_id = 0;
if (fork() == 0)
{
*child_id = Random::GenerateRandom64();
exit(EXIT_SUCCESS);
}
else
{
wait(nullptr);
auto parent_id = Random::GenerateRandom64();
auto child_id_copy = *child_id;
munmap(static_cast<void *>(child_id), sizeof(*child_id));
if (parent_id == child_id_copy)
{
std::cerr << "Child and parent ids are the same value " << parent_id << "\n";
return -1;
}
}
return 0;
}
#else
int main()
{
return 0;
}
#endif
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