A detached session stopped by SIGTERM, SIGINT or SIGHUP unlinks its sockets

The signals' default action ended the process where it stood, leaving
pardes-9p-*.sock and pardes-detached-*.sock for the next session to trip on.
The detached session now takes them to mean quit: the handler sets a flag and
wakes the loop, which leaves as Exit does, through the teardown that unlinks
both. fs.py sends each of the three and checks the sockets are gone.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 18 insertions, 0 deletions

diff --git a/test/fs.py b/test/fs.py
index b55ad5ab..45c38c2e 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -3,6 +3,7 @@ import contextlib
 import fcntl
 import json
 import os
+import signal
 from pathlib import Path
 import subprocess
 import struct
@@ -424,10 +425,27 @@ def exit_answers(binary):
                 raise AssertionError("Exit did not quit the editor")
 
 
+def signal_cleans_up(binary):
+    """A detached session told to stop by a signal unlinks its sockets."""
+    for sig in [signal.SIGTERM, signal.SIGINT, signal.SIGHUP]:
+        with tempfile.TemporaryDirectory(prefix='pardes-sig-') as directory:
+            root = Path(directory)
+            seen = {}
+            with session(binary, root, 'sig', terminal=seen) as (client, address):
+                detached = root / 'pardes-detached-sig.sock'
+                assert address.exists() and detached.exists()
+                os.kill(seen['pid'], sig)
+                deadline = time.monotonic() + 5
+                while (address.exists() or detached.exists()) and time.monotonic() < deadline:
+                    time.sleep(.01)
+                assert not address.exists() and not detached.exists(), (sig, list(root.iterdir()))
+
+
 def test(binary, quic=False):
     started = time.monotonic()
     run_file(binary)
     exit_answers(binary)
+    signal_cleans_up(binary)
     for options, message in [
         (['--fs'], b'no such option'),
         (['--fs9'], b'no such option'),