profcollectd: Don't exit if no trace provider is found

We need profcollectd to idle and ignore all requests in such case, so
that the event forwarding service won't need to constantly trying to
connect to it.

Bug: 79161490
Test: build
Change-Id: Id60baa6c975d1d580f227ef44a3d9b502b844847

1 files changed, 8 insertions, 2 deletions

diff --git a/profcollectd/libprofcollectd/scheduler.cpp b/profcollectd/libprofcollectd/scheduler.cpp
index 4c1fa302..eb47d843 100644
--- a/profcollectd/libprofcollectd/scheduler.cpp
+++ b/profcollectd/libprofcollectd/scheduler.cpp
@@ -98,10 +98,8 @@ ProfcollectdScheduler::ProfcollectdScheduler() {
   // Load a registered hardware trace provider.
   if ((hwtracer = REGISTER_SIMPLEPERF_ETM_PROVIDER())) {
     LOG(INFO) << "ETM provider registered.";
-    return;
   } else {
     LOG(ERROR) << "No hardware trace provider found for this architecture.";
-    exit(EXIT_FAILURE);
   }
 }
 
@@ -156,6 +154,10 @@ OptError ProfcollectdScheduler::TerminateCollection() {
 }
 
 OptError ProfcollectdScheduler::TraceOnce(const std::string& tag) {
+  if(!hwtracer) {
+    return "No trace provider registered.";
+  }
+
   const std::lock_guard<std::mutex> lock(mu);
   bool success = hwtracer->Trace(config.traceOutputDir, tag, config.samplingPeriod);
   if (!success) {
@@ -166,6 +168,10 @@ OptError ProfcollectdScheduler::TraceOnce(const std::string& tag) {
 }
 
 OptError ProfcollectdScheduler::ProcessProfile() {
+  if(!hwtracer) {
+    return "No trace provider registered.";
+  }
+
   const std::lock_guard<std::mutex> lock(mu);
   hwtracer->Process(config.traceOutputDir, config.profileOutputDir, config.binaryFilter);
   std::vector<fs::path> profiles;