84 lines
2.0 KiB
Python
84 lines
2.0 KiB
Python
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# Test custom pollable objects implemented in Python.
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from micropython import const
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try:
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import socket, select, io
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except ImportError:
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print("SKIP")
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raise SystemExit
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_MP_STREAM_POLL = const(3)
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_MP_STREAM_GET_FILENO = const(10)
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_MP_STREAM_POLL_RD = const(0x0001)
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_MP_STREAM_POLL_WR = const(0x0004)
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def print_poll_output(lst):
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print([(type(obj), flags) for obj, flags in lst])
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class CustomPollable(io.IOBase):
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def __init__(self):
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self.poll_state = 0
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def ioctl(self, cmd, arg):
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if cmd == _MP_STREAM_GET_FILENO:
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# Bare-metal ports don't call this ioctl, so don't print it.
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return -1
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print("CustomPollable.ioctl", cmd, arg)
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if cmd == _MP_STREAM_POLL:
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if self.poll_state == "delay_rd":
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self.poll_state = _MP_STREAM_POLL_RD
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return 0
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elif self.poll_state < 0:
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return self.poll_state
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else:
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return self.poll_state & arg
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poller = select.poll()
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# Use a new UDP socket for tests, which should be writable but not readable.
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try:
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.bind(socket.getaddrinfo("127.0.0.1", 8000)[0][-1])
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except OSError:
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print("SKIP")
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raise SystemExit
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x = CustomPollable()
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# Register both a file-descriptor-based object and a custom pure-Python object.
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poller.register(s)
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poller.register(x)
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# Modify the flags for the custom object.
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poller.modify(x, select.POLLIN)
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# Test polling.
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print_poll_output(poller.poll(0))
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x.poll_state = _MP_STREAM_POLL_WR
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print_poll_output(poller.poll(0))
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x.poll_state = _MP_STREAM_POLL_RD
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print_poll_output(poller.poll(0))
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# The custom object becomes readable only after being polled.
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poller.modify(s, select.POLLIN)
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x.poll_state = "delay_rd"
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print_poll_output(poller.poll())
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# The custom object returns an error.
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x.poll_state = -1000
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try:
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poller.poll(0)
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except OSError as er:
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print("OSError", er.errno)
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poller.unregister(x)
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poller.unregister(s)
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s.close()
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