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75 lines
1.8 KiB
75 lines
1.8 KiB
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
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.. c:namespace:: DTV.fe |
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.. _FE_GET_PROPERTY: |
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************************************** |
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ioctl FE_SET_PROPERTY, FE_GET_PROPERTY |
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************************************** |
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Name |
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==== |
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FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties. |
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Synopsis |
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======== |
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.. c:macro:: FE_GET_PROPERTY |
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``int ioctl(int fd, FE_GET_PROPERTY, struct dtv_properties *argp)`` |
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.. c:macro:: FE_SET_PROPERTY |
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``int ioctl(int fd, FE_SET_PROPERTY, struct dtv_properties *argp)`` |
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Arguments |
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========= |
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``fd`` |
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File descriptor returned by :c:func:`open()`. |
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``argp`` |
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Pointer to struct :c:type:`dtv_properties`. |
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Description |
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=========== |
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All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and |
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``FE_GET_PROPERTY`` ioctls. The supported properties and statistics |
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depends on the delivery system and on the device: |
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- ``FE_SET_PROPERTY:`` |
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- This ioctl is used to set one or more frontend properties. |
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- This is the basic command to request the frontend to tune into |
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some frequency and to start decoding the digital TV signal. |
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- This call requires read/write access to the device. |
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.. note:: |
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At return, the values aren't updated to reflect the actual |
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parameters used. If the actual parameters are needed, an explicit |
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call to ``FE_GET_PROPERTY`` is needed. |
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- ``FE_GET_PROPERTY:`` |
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- This ioctl is used to get properties and statistics from the |
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frontend. |
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- No properties are changed, and statistics aren't reset. |
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- This call only requires read-only access to the device. |
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Return Value |
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============ |
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On success 0 is returned. |
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On error -1 is returned, and the ``errno`` variable is set |
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appropriately. |
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Generic error codes are described at the |
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:ref:`Generic Error Codes <gen-errors>` chapter.
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