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📁 ..	-	2025-02-27 15:06
📄 __init__.py # -- coding: utf-8 -- # Copyright (C) 2015 mulhern <amulhern@redhat.com> # This library is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation; either version 2.1 of the License, or (at your # option) any later version. # This library is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License # for more details. # You should have received a copy of the GNU Lesser General Public License # along with this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev._os ========== Extras to compensate for deficiencies in python os module. .. moduleauthor:: mulhern <amulhern@redhat.com> """ from . import pipe from . import poll	992 B	2020-01-24 21:52
📁 __pycache__	-	2025-02-27 15:06
📄 pipe.py # -- coding: utf-8 -- # Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com> # This library is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation; either version 2.1 of the License, or (at your # option) any later version. # This library is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License # for more details. # You should have received a copy of the GNU Lesser General Public License # along with this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev._os.pipe =============== Fallback implementations for pipe. 1. pipe2 from python os module 2. pipe2 from libc 3. pipe from python os module The Pipe class wraps the chosen implementation. .. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com> """ from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals import os import fcntl from functools import partial from pyudev._ctypeslib.libc import ERROR_CHECKERS from pyudev._ctypeslib.libc import FD_PAIR from pyudev._ctypeslib.libc import SIGNATURES from pyudev._ctypeslib.utils import load_ctypes_library # Define O_CLOEXEC, if not present in os already O_CLOEXEC = getattr(os, 'O_CLOEXEC', 0o2000000) def _pipe2_ctypes(libc, flags): """A ``pipe2`` implementation using ``pipe2`` from ctypes. ``libc`` is a :class:`ctypes.CDLL` object for libc. ``flags`` is an integer providing the flags to ``pipe2``. Return a pair of file descriptors ``(r, w)``. """ fds = FD_PAIR() libc.pipe2(fds, flags) return fds[0], fds[1] def _pipe2_by_pipe(flags): """A ``pipe2`` implementation using :func:`os.pipe`. ``flags`` is an integer providing the flags to ``pipe2``. .. warning:: This implementation is not atomic! Return a pair of file descriptors ``(r, w)``. """ fds = os.pipe() if flags & os.O_NONBLOCK != 0: for fd in fds: set_fd_status_flag(fd, os.O_NONBLOCK) if flags & O_CLOEXEC != 0: for fd in fds: set_fd_flag(fd, O_CLOEXEC) return fds def _get_pipe2_implementation(): """Find the appropriate implementation for ``pipe2``. Return a function implementing ``pipe2``.""" if hasattr(os, 'pipe2'): return os.pipe2 # pylint: disable=no-member else: try: libc = load_ctypes_library("libc", SIGNATURES, ERROR_CHECKERS) return (partial(_pipe2_ctypes, libc) if hasattr(libc, 'pipe2') else _pipe2_by_pipe) except ImportError: return _pipe2_by_pipe _PIPE2 = _get_pipe2_implementation() def set_fd_flag(fd, flag): """Set a flag on a file descriptor. ``fd`` is the file descriptor or file object, ``flag`` the flag as integer. """ flags = fcntl.fcntl(fd, fcntl.F_GETFD, 0) fcntl.fcntl(fd, fcntl.F_SETFD, flags \| flag) def set_fd_status_flag(fd, flag): """Set a status flag on a file descriptor. ``fd`` is the file descriptor or file object, ``flag`` the flag as integer. """ flags = fcntl.fcntl(fd, fcntl.F_GETFL, 0) fcntl.fcntl(fd, fcntl.F_SETFL, flags \| flag) class Pipe(object): """A unix pipe. A pipe object provides two file objects: :attr:`source` is a readable file object, and :attr:`sink` a writeable. Bytes written to :attr:`sink` appear at :attr:`source`. Open a pipe with :meth:`open()`. """ @classmethod def open(cls): """Open and return a new :class:`Pipe`. The pipe uses non-blocking IO.""" source, sink = _PIPE2(os.O_NONBLOCK \| O_CLOEXEC) return cls(source, sink) def __init__(self, source_fd, sink_fd): """Create a new pipe object from the given file descriptors. ``source_fd`` is a file descriptor for the readable side of the pipe, ``sink_fd`` is a file descriptor for the writeable side.""" self.source = os.fdopen(source_fd, 'rb', 0) self.sink = os.fdopen(sink_fd, 'wb', 0) def close(self): """Closes both sides of the pipe.""" try: self.source.close() finally: self.sink.close()	4.42 KB	2020-01-24 21:52
📄 poll.py # -- coding: utf-8 -- # Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com> # This library is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation; either version 2.1 of the License, or (at your # option) any later version. # This library is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License # for more details. # You should have received a copy of the GNU Lesser General Public License # along with this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev._os.poll =============== Operating system interface for pyudev. .. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com> """ from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals import select from pyudev._util import eintr_retry_call class Poll(object): """A poll object. This object essentially provides a more convenient interface around :class:`select.poll`. """ _EVENT_TO_MASK = {'r': select.POLLIN, 'w': select.POLLOUT} @staticmethod def _has_event(events, event): return events & event != 0 @classmethod def for_events(cls, *events): """Listen for ``events``. ``events`` is a list of ``(fd, event)`` pairs, where ``fd`` is a file descriptor or file object and ``event`` either ``'r'`` or ``'w'``. If ``r``, listen for whether that is ready to be read. If ``w``, listen for whether the channel is ready to be written to. """ notifier = eintr_retry_call(select.poll) for fd, event in events: mask = cls._EVENT_TO_MASK.get(event) if not mask: raise ValueError('Unknown event type: {0!r}'.format(event)) notifier.register(fd, mask) return cls(notifier) def __init__(self, notifier): """Create a poll object for the given ``notifier``. ``notifier`` is the :class:`select.poll` object wrapped by the new poll object. """ self._notifier = notifier def poll(self, timeout=None): """Poll for events. ``timeout`` is an integer specifying how long to wait for events (in milliseconds). If omitted, ``None`` or negative, wait until an event occurs. Return a list of all events that occurred before ``timeout``, where each event is a pair ``(fd, event)``. ``fd`` is the integral file descriptor, and ``event`` a string indicating the event type. If ``'r'``, there is data to read from ``fd``. If ``'w'``, ``fd`` is writable without blocking now. If ``'h'``, the file descriptor was hung up (i.e. the remote side of a pipe was closed). """ # Return a list to allow clients to determine whether there are any # events at all with a simple truthiness test. return list( self._parse_events(eintr_retry_call(self._notifier.poll, timeout))) def _parse_events(self, events): """Parse ``events``. ``events`` is a list of events as returned by :meth:`select.poll.poll()`. Yield all parsed events. """ for fd, event_mask in events: if self._has_event(event_mask, select.POLLNVAL): raise IOError('File descriptor not open: {0!r}'.format(fd)) elif self._has_event(event_mask, select.POLLERR): raise IOError('Error while polling fd: {0!r}'.format(fd)) if self._has_event(event_mask, select.POLLIN): yield fd, 'r' if self._has_event(event_mask, select.POLLOUT): yield fd, 'w' if self._has_event(event_mask, select.POLLHUP): yield fd, 'h'	4.02 KB	2020-01-24 21:52

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