1 files changed, 53 insertions, 0 deletions
diff --git a/src/jaegertracing/opentelemetry-cpp/sdk/test/common/random_fork_test.cc b/src/jaegertracing/opentelemetry-cpp/sdk/test/common/random_fork_test.cc
new file mode 100644
index 000000000..2db8b9fcd
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/sdk/test/common/random_fork_test.cc
@@ -0,0 +1,53 @@
+// 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