Use os.pipe() socket pair for Widows/macOS

Author: kernc

efck/gui.py

@@ -1,7 +1,7 @@
 import atexit
 import logging
+import os
 import signal
-import socket
 from pathlib import Path
 
 from . import IS_MACOS, IS_WIDOWS
@@ -363,20 +363,20 @@ def reset_window_position(self):
         self.setGeometry(QRect(*top_left + geometry))
 
     def install_sigusr1_handler(self):
-        self._socket_pair = (rsock, wsock) = socket.socketpair(socket.AF_UNIX, socket.SOCK_STREAM, 0)
-        self._notifier = notifier = QSocketNotifier(rsock.fileno(), QSocketNotifier.Type.Read, self)
+        r_fd, w_fd = os.pipe()
+        if not IS_WIDOWS:
+            os.set_blocking(w_fd, False)
+        atexit.register(os.close, r_fd)
+        atexit.register(os.close, w_fd)
+        self._notifier = notifier = QSocketNotifier(r_fd, QSocketNotifier.Type.Read, self)
         # https://stackoverflow.com/questions/4938723/what-is-the-correct-way-to/37229299#37229299
-        wsock.setblocking(False)
-        signal.set_wakeup_fd(wsock.fileno())
+        signal.set_wakeup_fd(w_fd)
         signal.signal(OUR_SIGUSR1, lambda sig, frame: None)
-        # Avoid ResourceWarning on exit
-        atexit.register(rsock.close)
-        atexit.register(wsock.close)
 
         def sigusr1_received():
-            nonlocal notifier, self, rsock
+            nonlocal notifier, self, r_fd
             notifier.setEnabled(False)
-            signum = ord(rsock.recv(1))
+            signum = ord(os.read(r_fd, 1))
             if signum == OUR_SIGUSR1:
                 logger.info('Handled SIGUSR1. Showing up!')
                 self.reset_window_position()