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steamvr_drv: adopt a respawned compositor instead of restarting the session

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DisplayRecovery froze its compositor handle while the loss latch was set,
so a compositor SteamVR had already respawned still looked dead and the
guard SIGTERMed a self-healed session. Re-pin whenever the tracked
generation exits and a unique replacement exists; keep the dead handle
only while nothing replaced it.
This commit is contained in:
lbgos committed 2026-10-13 07:27:18 +03:00
1 parent 7965751cc9
commit d18846dcbc
1 file changed
+10 -3
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src/xrt/state_trackers/steamvr_drv/ovrd_roomsetup_guard.cpp
+10 -3
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@@ -243,9 +243,16 @@ public:
bool stable = display_health.update(connected && !exited(compositor), vsync_age, vsync, now);
if (connected) {
connected_once = true;
if (!lost && exited(compositor)) {
if (compositor >= 0) close(compositor);
compositor = unique_runtime_process(runtime / "vrcompositor");
if (exited(compositor)) {
// Adopt a replacement compositor if SteamVR already respawned
// one: killing the session then would destroy a self-healed
// display. Keep the dead handle as evidence while no
// replacement exists so the trigger below still fires.
int replacement = unique_runtime_process(runtime / "vrcompositor");
if (replacement >= 0) {
if (compositor >= 0) close(compositor);
compositor = replacement;
}
}
// A watchdog can exit well after USB returns. Disarm only after native
// vsync advances continuously, never merely because the process lives.