def filter_by(self, subsystem, device_type=None):
"""
Filter incoming events.
``subsystem`` is a byte or unicode string with the name of a
subsystem (e.g. ``'input'``). Only events originating from the
given subsystem pass the filter and are handed to the caller.
If given, ``device_type`` is a byte or unicode string specifying the
device type. Only devices with the given device type are propagated
to the caller. If ``device_type`` is not given, no additional
filter for a specific device type is installed.
These filters are executed inside the kernel, and client processes
will usually not be woken up for device, that do not match these
filters.
.. versionchanged:: 0.15
This method can also be after :meth:`start()` now.
"""
subsystem = ensure_byte_string(subsystem)
if device_type:
device_type = ensure_byte_string(device_type)
libudev.udev_monitor_filter_add_match_subsystem_devtype(
self, subsystem, device_type)
libudev.udev_monitor_filter_update(self)
def filter_by(self, subsystem, device_type=None):
"""
Filter incoming events.
``subsystem`` is a byte or unicode string with the name of a
subsystem (e.g. ``'input'``). Only events originating from the
given subsystem pass the filter and are handed to the caller.
If given, ``device_type`` is a byte or unicode string specifying the
device type. Only devices with the given device type are propagated
to the caller. If ``device_type`` is not given, no additional
filter for a specific device type is installed.
These filters are executed inside the kernel, and client processes
will usually not be woken up for device, that do not match these
filters.
.. versionchanged:: 0.15
This method can also be after :meth:`start()` now.
"""
subsystem = ensure_byte_string(subsystem)
if device_type:
device_type = ensure_byte_string(device_type)
libudev.udev_monitor_filter_add_match_subsystem_devtype(
self, subsystem, device_type)
libudev.udev_monitor_filter_update(self)
def remove_filter(self):
"""
Remove any filters installed with :meth:`filter_by()` or
:meth:`filter_by_tag()` from this monitor.
.. warning::
Up to udev 181 (and possibly even later versions) the underlying
``udev_monitor_filter_remove()`` seems to be broken. If used with
affected versions this method always raises
:exc:`~exceptions.ValueError`.
Raise :exc:`~exceptions.EnvironmentError` if removal of installed
filters failed.
.. versionadded:: 0.15
"""
libudev.udev_monitor_filter_remove(self)
libudev.udev_monitor_filter_update(self)
def remove_filter(self):
"""
Remove any filters installed with :meth:`filter_by()` or
:meth:`filter_by_tag()` from this monitor.
.. warning::
Up to udev 181 (and possibly even later versions) the underlying
``udev_monitor_filter_remove()`` seems to be broken. If used with
affected versions this method always raises
:exc:`~exceptions.ValueError`.
Raise :exc:`~exceptions.EnvironmentError` if removal of installed
filters failed.
.. versionadded:: 0.15
"""
libudev.udev_monitor_filter_remove(self)
libudev.udev_monitor_filter_update(self)
def filter_by_tag(self, tag):
"""
Filter incoming events by the given ``tag``.
``tag`` is a byte or unicode string with the name of a tag. Only
events for devices which have this tag attached pass the filter and are
handed to the caller.
Like with :meth:`filter_by` this filter is also executed inside the
kernel, so that client processes are usually not woken up for devices
without the given ``tag``.
.. udevversion:: 154
.. versionadded:: 0.9
.. versionchanged:: 0.15
This method can also be after :meth:`start()` now.
"""
libudev.udev_monitor_filter_add_match_tag(
self, ensure_byte_string(tag))
libudev.udev_monitor_filter_update(self)
def filter_by_tag(self, tag):
"""
Filter incoming events by the given ``tag``.
``tag`` is a byte or unicode string with the name of a tag. Only
events for devices which have this tag attached pass the filter and are
handed to the caller.
Like with :meth:`filter_by` this filter is also executed inside the
kernel, so that client processes are usually not woken up for devices
without the given ``tag``.
.. udevversion:: 154
.. versionadded:: 0.9
.. versionchanged:: 0.15
This method can also be after :meth:`start()` now.
"""
libudev.udev_monitor_filter_add_match_tag(self,
ensure_byte_string(tag))
libudev.udev_monitor_filter_update(self)
