Function emergencyCleanup

browse/src/server.ts:1392–1424

()

// Emergency cleanup for crashes (OOM, uncaught exceptions, browser disconnect)
function emergencyCleanup() {
  if (isShuttingDown) return;
  isShuttingDown = true;
  // Xvfb cleanup MUST happen before state-file deletion. spawnXvfb detaches
  // the child, so without this, an uncaught exception leaves the Xvfb
  // running with no PID record — orphan accumulates and eventually
  // exhausts the :99-:120 display range. Read the state file FIRST,
  // call cleanupXvfb (validates cmdline + start-time before kill), THEN
  // delete the state file.
  try {
    if (fs.existsSync(config.stateFile)) {
      const raw = fs.readFileSync(config.stateFile, 'utf-8');
      const state = JSON.parse(raw);
      if (state.xvfbPid && state.xvfbStartTime) {
        // Lazy import — emergencyCleanup may run on platforms where
        // ./xvfb's Linux-specific helpers fail to load. Best effort.
        try {
          const { cleanupXvfb } = require('./xvfb');
          cleanupXvfb({
            pid: state.xvfbPid,
            startTime: state.xvfbStartTime,
            display: state.xvfbDisplay || ':99',
          });
        } catch { /* best effort */ }
      }
    }
  } catch { /* state file unparseable — fall through to lock + state cleanup */ }

  // Clean Chromium profile locks via the shared helper (defensive guard
  // refuses to operate on unrecognized profile dirs).
  cleanSingletonLocks(resolveChromiumProfile());
  safeUnlinkQuiet(config.stateFile);
}
// Same import.meta.main gate as SIGINT/SIGTERM — embedders register their
// own crash handlers.
if (import.meta.main) {