From ae9f6a5616f366f0d66bdf6e0ca7b59ca268b639 Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <117672381+akleshchev@users.noreply.github.com>
Date: Sun, 26 Apr 2026 14:44:28 +0300
Subject: p#5719 Detect hybernation

I'm not sure if viewer should actually be shutting down on this, but as
a minimum we should be updating or clearing marker files. If viewer
crashes because of a hibernation, it isn't our problem. Viewer isn't
built for that and we can't maintain 'heartbeats' in hibernation.
---
 indra/llwindow/llwindowwin32.cpp | 42 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'indra/llwindow/llwindowwin32.cpp')

diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 3cb2911f9a..7e956983d0 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -2587,6 +2587,7 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
             {
                 window_imp->post([=]()
                 {
+                    LL_INFOS("Window") << "Shutting down due to session terminating" << LL_ENDL;
                     // Check if app needs cleanup or can be closed immediately.
                     if (window_imp->mCallbacks->handleSessionExit(window_imp))
                     {
@@ -2605,6 +2606,47 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
             // if session is ending OS is going to take care of it.
             return 0;
         }
+        case WM_POWERBROADCAST:
+        {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_POWERBROADCAST");
+            switch (w_param)
+            {
+            case PBT_APMSUSPEND:
+                LL_INFOS("Window") << "System is suspending (sleep/hibernate)" << LL_ENDL;
+                // System is about to enter sleep or hibernation
+                // Viewer can't function in hibernation, try to shut down.
+                // The system allows approximately two seconds for an
+                // application to handle this notification.
+                window_imp->post([=]()
+                {
+                    LL_INFOS("Window") << "Shutting down due to system suspending (sleep/hibernate)" << LL_ENDL;
+                    if (window_imp->mCallbacks->handleSessionExit(window_imp))
+                    {
+                        // Get the app to initiate cleanup.
+                        window_imp->mCallbacks->handleQuit(window_imp);
+                    }
+                });
+                ms_sleep(1000);
+                return TRUE;
+
+            case PBT_APMRESUMESUSPEND:
+                LL_INFOS("Window") << "System is resuming from suspend" << LL_ENDL;
+                // Shouldn't be up, but log just in case.
+                return TRUE;
+
+            case PBT_APMPOWERSTATUSCHANGE:
+                LL_INFOS("Window") << "Power status has changed" << LL_ENDL;
+                // Power status change (AC/battery)
+                // Viewer requires high performance, not much we can do.
+                // about it, but log for diagnostic purposes (example:
+                // OS trying to throw viewer at an iGPU after this message)
+                return TRUE;
+
+            default:
+                break;
+            }
+            break;
+        }
         case WM_POST_UNINSTALL_:
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_POST_UNINSTALL_");
-- 
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