diff --git a/examples/sdk/example_custom_data_source.cc b/examples/sdk/example_custom_data_source.cc
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+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This example demonstrates a custom tracing data source.
+
+#include <perfetto.h>
+
+#include <fstream>
+#include <thread>
+
+// The definition of our custom data source. Instances of this class will be
+// automatically created and destroyed by Perfetto.
+class CustomDataSource : public perfetto::DataSource<CustomDataSource> {
+ public:
+  void OnSetup(const SetupArgs&) override {
+    // Use this callback to apply any custom configuration to your data source
+    // based on the TraceConfig in SetupArgs.
+  }
+
+  // Optional callbacks for tracking the lifecycle of the data source.
+  void OnStart(const StartArgs&) override {}
+  void OnStop(const StopArgs&) override {}
+};
+
+PERFETTO_DECLARE_DATA_SOURCE_STATIC_MEMBERS(CustomDataSource);
+PERFETTO_DEFINE_DATA_SOURCE_STATIC_MEMBERS(CustomDataSource);
+
+void InitializePerfetto() {
+  perfetto::TracingInitArgs args;
+  // The backends determine where trace events are recorded. For this example we
+  // are going to use the in-process tracing service, which only includes in-app
+  // events.
+  args.backends = perfetto::kInProcessBackend;
+  perfetto::Tracing::Initialize(args);
+
+  // Register our custom data source. Only the name is required, but other
+  // properties can be advertised too.
+  perfetto::DataSourceDescriptor dsd;
+  dsd.set_name("com.example.custom_data_source");
+  CustomDataSource::Register(dsd);
+}
+
+std::unique_ptr<perfetto::TracingSession> StartTracing() {
+  // The trace config defines which types of data sources are enabled for
+  // recording. In this example we enable the custom data source we registered
+  // above.
+  perfetto::TraceConfig cfg;
+  cfg.add_buffers()->set_size_kb(1024);
+  auto* ds_cfg = cfg.add_data_sources()->mutable_config();
+  ds_cfg->set_name("com.example.custom_data_source");
+
+  auto tracing_session = perfetto::Tracing::NewTrace();
+  tracing_session->Setup(cfg);
+  tracing_session->StartBlocking();
+  return tracing_session;
+}
+
+void StopTracing(std::unique_ptr<perfetto::TracingSession> tracing_session) {
+  // Flush to make sure the last written event ends up in the trace.
+  CustomDataSource::Trace(
+      [](CustomDataSource::TraceContext ctx) { ctx.Flush(); });
+
+  // Stop tracing and read the trace data.
+  tracing_session->StopBlocking();
+  std::vector<char> trace_data(tracing_session->ReadTraceBlocking());
+
+  // Write the result into a file.
+  // Note: To save memory with longer traces, you can tell Perfetto to write
+  // directly into a file by passing a file descriptor into Setup() above.
+  std::ofstream output;
+  output.open("example_custom_data_source.pftrace",
+              std::ios::out | std::ios::binary);
+  output.write(&trace_data[0], trace_data.size());
+  output.close();
+}
+
+int main(int, const char**) {
+  InitializePerfetto();
+  auto tracing_session = StartTracing();
+
+  // Write an event using our custom data source.
+  CustomDataSource::Trace([](CustomDataSource::TraceContext ctx) {
+    auto packet = ctx.NewTracePacket();
+    packet->set_timestamp(42);
+    packet->set_for_testing()->set_str("Hello world!");
+  });
+
+  StopTracing(std::move(tracing_session));
+  return 0;
+}