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71 lines
1.8 KiB
Python
71 lines
1.8 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2011 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Posix implementations of platform-specific functionality."""
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from __future__ import absolute_import, division, print_function, with_statement
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import fcntl
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import os
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from tornado.platform import interface
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def set_close_exec(fd):
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
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def _set_nonblocking(fd):
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flags = fcntl.fcntl(fd, fcntl.F_GETFL)
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fcntl.fcntl(fd, fcntl.F_SETFL, flags | os.O_NONBLOCK)
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class Waker(interface.Waker):
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def __init__(self):
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r, w = os.pipe()
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_set_nonblocking(r)
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_set_nonblocking(w)
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set_close_exec(r)
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set_close_exec(w)
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self.reader = os.fdopen(r, "rb", 0)
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self.writer = os.fdopen(w, "wb", 0)
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def fileno(self):
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return self.reader.fileno()
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def write_fileno(self):
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return self.writer.fileno()
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def wake(self):
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try:
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self.writer.write(b"x")
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except IOError:
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pass
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def consume(self):
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try:
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while True:
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result = self.reader.read()
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if not result:
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break
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except IOError:
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pass
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def close(self):
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self.reader.close()
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self.writer.close()
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