trace_events: add process_name metadata

PR-URL: https://github.com/nodejs/node/pull/21477
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/node.cc b/src/node.cc
index 0db313fd36..4fb793705b 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1665,6 +1665,8 @@ static void ProcessTitleSetter(Local<Name> property,
                                Local<Value> value,
                                const PropertyCallbackInfo<void>& info) {
   node::Utf8Value title(info.GetIsolate(), value);
+  TRACE_EVENT_METADATA1("__metadata", "process_name", "name",
+                        TRACE_STR_COPY(*title));
   uv_set_process_title(*title);
 }
 
@@ -3525,6 +3527,13 @@ inline int Start(Isolate* isolate, IsolateData* isolate_data,
   Environment env(isolate_data, context, v8_platform.GetTracingAgent());
   env.Start(argc, argv, exec_argc, exec_argv, v8_is_profiling);
 
+  char name_buffer[512];
+  if (uv_get_process_title(name_buffer, sizeof(name_buffer)) == 0) {
+    // Only emit the metadata event if the title can be retrieved successfully.
+    // Ignore it otherwise.
+    TRACE_EVENT_METADATA1("__metadata", "process_name", "name",
+                          TRACE_STR_COPY(name_buffer));
+  }
   TRACE_EVENT_METADATA1("__metadata", "version", "node", NODE_VERSION_STRING);
   TRACE_EVENT_METADATA1("__metadata", "thread_name", "name",
                         "JavaScriptMainThread");