def _install_signal_checker(self):
self._socketpair = SocketPair()
self._signal_checker = None
if hasattr(signal, 'set_wakeup_fd') and os.name == 'posix':
try:
old_wakeup_fd = signal.set_wakeup_fd(
self._socketpair.writer_fileno())
if old_wakeup_fd != -1:
# Already set, restore it
signal.set_wakeup_fd(old_wakeup_fd)
self._socketpair.close()
self._socketpair = None
else:
self._signal_checker = pyuv.util.SignalChecker(
self._loop, self._socketpair.reader_fileno())
self._signal_checker.start()
self._signal_checker.unref()
except ValueError:
self._socketpair.close()
self._socketpair = None
