def register():
'''
This function creates a select.poll object that can be used in the same
manner as signal.pause(). The poll object returns each time a signal was
received by the process.
This function has to be called from the main thread.
'''
global _signal_poller
global _signal_read_fd
if _signal_poller is not None:
raise RuntimeError('register was already called')
read_fd, write_fd = os.pipe()
# Python c-level signal handler requires that the write end will be in
# non blocking mode
filecontrol.set_non_blocking(write_fd)
# Set the read pipe end to non-blocking too, just in case.
filecontrol.set_non_blocking(read_fd)
# Prevent subproccesses we execute from inheriting the pipes.
filecontrol.set_close_on_exec(write_fd)
filecontrol.set_close_on_exec(read_fd)
signal.set_wakeup_fd(write_fd)
poller = select.poll()
poller.register(read_fd, select.POLLIN)
_signal_poller = poller
_signal_read_fd = read_fd
def __init__(self, map):
rfd, wfd = os.pipe()
asyncore.file_dispatcher.__init__(self, rfd, map=map)
os.close(rfd) # file_dispatcher duped it
filecontrol.set_close_on_exec(self._fileno)
filecontrol.set_close_on_exec(wfd)
filecontrol.set_non_blocking(wfd)
self._wfd = wfd
def __init__(self, map):
rfd, wfd = os.pipe()
asyncore.file_dispatcher.__init__(self, rfd, map=map)
os.close(rfd) # file_dispatcher duped it
filecontrol.set_close_on_exec(self._fileno)
filecontrol.set_close_on_exec(wfd)
filecontrol.set_non_blocking(wfd)
self._wfd = wfd
def test_blocking(self):
with open_fd() as fd:
self.assertEqual(0, filecontrol.set_non_blocking(fd, False))
self.assertFalse(os.O_NONBLOCK & fcntl.fcntl(fd, fcntl.F_GETFL))
def test_blocking(self):
with open_fd() as fd:
self.assertEqual(0, filecontrol.set_non_blocking(fd, False))
self.assertFalse(os.O_NONBLOCK & fcntl.fcntl(fd, fcntl.F_GETFL))
