Kill the child processes at once on a second interrupt during the grace period

src/lib.rs

@@ -114,6 +114,6 @@ pub fn run(config: SandboxConfig) -> Result<ExitStatus, SandboxError> {
     // bwrap ignores them: its death would SIGKILL the entrypoint through --die-with-parent.
     let bwrap_process = bwrap.spawn(signal_forwarder.ignore_forwarded_signals())?;
     let status = signal_forwarder.forward_until_exit(&bwrap_process)?;
-    process_tree::terminate_and_reap_all(CLEANUP_GRACE_PERIOD)?;
+    process_tree::terminate_and_reap_all(CLEANUP_GRACE_PERIOD, signals::has_pending_interrupt)?;
     Ok(status)
 }