Wrap fileno() method

Author: davidbrochart

src/zmq_anyio/_socket.py

@@ -194,6 +194,12 @@ def __init__(
         self._task_group = task_group
         self.__stack = None
 
+    def fileno(self) -> int:
+        try:
+            return super().fileno()
+        except zmq.error.ZMQError:
+            return -1
+
     def get(self, key):
         result = super().get(key)
         if key == EVENTS:

tests/test_socket.py

@@ -341,8 +341,12 @@ async def test_close(create_bound_pair):
         async with create_task_group() as tg:
             await tg.start(a.start)
             await tg.start(b.start)
+            print(f"{a.fileno()=}")
+            print(f"{b.fileno()=}")
             a.close()
             b.close()
+            print(f"{a.fileno()=}")
+            print(f"{b.fileno()=}")
             await sleep(0.1)