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- .. -*- coding: utf-8; mode: rst -*-
- .. _FE_GET_PROPERTY:
- **************************************
- ioctl FE_SET_PROPERTY, FE_GET_PROPERTY
- **************************************
- Name
- ====
- FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties.
- Synopsis
- ========
- .. c:function:: int ioctl( int fd, FE_GET_PROPERTY, struct dtv_properties *argp )
- :name: FE_GET_PROPERTY
- .. c:function:: int ioctl( int fd, FE_SET_PROPERTY, struct dtv_properties *argp )
- :name: FE_SET_PROPERTY
- Arguments
- =========
- ``fd``
- File descriptor returned by :ref:`open() <frontend_f_open>`.
- ``argp``
- Pointer to struct :c:type:`dtv_properties`.
- Description
- ===========
- All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and
- ``FE_GET_PROPERTY`` ioctls. The supported properties and statistics
- depends on the delivery system and on the device:
- - ``FE_SET_PROPERTY:``
- - This ioctl is used to set one or more frontend properties.
- - This is the basic command to request the frontend to tune into
- some frequency and to start decoding the digital TV signal.
- - This call requires read/write access to the device.
- .. note::
- At return, the values aren't updated to reflect the actual
- parameters used. If the actual parameters are needed, an explicit
- call to ``FE_GET_PROPERTY`` is needed.
- - ``FE_GET_PROPERTY:``
- - This ioctl is used to get properties and statistics from the
- frontend.
- - No properties are changed, and statistics aren't reset.
- - This call only requires read-only access to the device.
- Return Value
- ============
- On success 0 is returned.
- On error -1 is returned, and the ``errno`` variable is set
- appropriately.
- Generic error codes are described at the
- :ref:`Generic Error Codes <gen-errors>` chapter.
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