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a 8g+^ � @ s\ d Z ddlmZ ddlmZ ddlmZ ddlmZ ddlZddlmZ G dd � d e �Z dS ) z� pyudev._os.poll =============== Operating system interface for pyudev. .. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com> � )�absolute_import)�division)�print_function)�unicode_literalsN)�eintr_retry_callc @ sP e Zd ZdZejejd�Zedd� �Z e dd� �Z dd� Z dd d �Z d d � Zd S )�PollzwA poll object. This object essentially provides a more convenient interface around :class:`select.poll`. )�r�wc C s | |@ dkS )Nr � )�events�eventr r �3/usr/lib/python3.9/site-packages/pyudev/_os/poll.py� _has_event. s zPoll._has_eventc G sJ t tj�}|D ]2\}}| j�|�}|s4td�|���|�||� q| |�S )aG 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. zUnknown event type: {0!r})r �select�poll�_EVENT_TO_MASK�get� ValueError�format�register)�clsr �notifier�fdr �maskr r r � for_events2 s zPoll.for_eventsc C s || _ dS )z�Create a poll object for the given ``notifier``. ``notifier`` is the :class:`select.poll` object wrapped by the new poll object. N)� _notifier)�selfr r r r �__init__D s z Poll.__init__Nc C s t | �t| jj|���S )a{ 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). )�list� _parse_eventsr r r )r �timeoutr r r r M s �z Poll.pollc c s� |D ]�\}}| � |tj�r*td�|���n | � |tj�rFtd�|���| � |tj�r^|dfV | � |tj�rv|dfV | � |tj�r|dfV qdS )z�Parse ``events``. ``events`` is a list of events as returned by :meth:`select.poll.poll()`. Yield all parsed events. z File descriptor not open: {0!r}z Error while polling fd: {0!r}r r �hN) r r ZPOLLNVAL�IOErrorr ZPOLLERR�POLLIN�POLLOUTZPOLLHUP)r r r Z event_maskr r r r a s zPoll._parse_events)N)�__name__� __module__� __qualname__�__doc__r r# r$ r � staticmethodr � classmethodr r r r r r r r r $ s r ) r( Z __future__r r r r r Z pyudev._utilr �objectr r r r r �<module> s
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