graceful sigint

megacom/__init__.py

@@ -3,6 +3,7 @@ import asyncio
 import contextlib
 import errno
 import re
+import signal
 import sys
 import termios
 import tty
@@ -124,8 +125,14 @@ async def megacom(tty: str, baud: int, mode: str, logfile: Optional[str]) -> Non
 
     loop = asyncio.get_event_loop()
     keycodes = KeycodeHandler()
-    return await megacom_main(stdin, stdout, tty, baud, bytesize, parity, stopbits, loop, keycodes,
+
-                              log)
+    loop.add_signal_handler(signal.SIGINT, lambda: keycodes.exit_flag.set())
+
+    try:
+        return await megacom_main(stdin, stdout, tty, baud, bytesize, parity, stopbits, loop,
+                                  keycodes, log)
+    finally:
+        loop.remove_signal_handler(signal.SIGINT)
 
 
 async def megacom_main(stdin: asyncio.StreamReader, stdout: asyncio.StreamWriter, tty: str,