Bug 1533889 - Investigate OpenProcess failures r=mconley

Differential Revision: https://phabricator.services.mozilla.com/D29571 --HG-- extra : moz-landing-system : lando
trman · May 2, 2019 · 18fbf9f · 18fbf9f
1 parent 8d9ae81
commit 18fbf9f
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/hal/windows/WindowsProcessPriority.cpp b/hal/windows/WindowsProcessPriority.cpp
@@ -20,6 +20,12 @@ void SetProcessPriority(int aPid, ProcessPriority aPriority) {
 
   nsAutoHandle processHandle(
       ::OpenProcess(PROCESS_SET_INFORMATION, FALSE, aPid));
+#ifdef DEBUG
+  if (!processHandle) {
+    printf_stderr("::OpenProcess() failed with error %#08x\n",
+                  ::GetLastError());
+  }
+#endif  // DEBUG
   MOZ_ASSERT(processHandle);
   if (processHandle) {
     DWORD priority = NORMAL_PRIORITY_CLASS;