Mirror signal deaths from real-time signals

tests/e2e/forwarding.rs

@@ -50,6 +50,21 @@ fn forwarded_signal_death_of_entrypoint_is_mirrored() {
     assert_eq!(status.signal(), Some(libc::SIGTERM));
 }
 
+#[test]
+fn forwarded_realtime_signal_death_of_entrypoint_is_mirrored() {
+    let dir = TempDir::new().expect("failed to create temp dir");
+    let realtime = libc::SIGRTMIN() + 1;
+    let script = ": > ready
+                  sleep 60";
+
+    let (_sandbox, mut child) = spawn_sandbox(&["--blacklist"], dir.path(), script);
+    wait_for_file(&dir.path().join("ready"));
+    send_signal(&child, realtime);
+    let status = child.wait().unwrap();
+
+    assert_eq!(status.signal(), Some(realtime));
+}
+
 #[test]
 fn user_and_realtime_signals_reach_entrypoint() {
     let dir = TempDir::new().expect("failed to create temp dir");