.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.ca
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.. _CA_SET_DESCR:
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============
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CA_SET_DESCR
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============
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Name
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----
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CA_SET_DESCR
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Synopsis
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--------
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.. c:macro:: CA_SET_DESCR
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``int ioctl(fd, CA_SET_DESCR, struct ca_descr *desc)``
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Arguments
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---------
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``fd``
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File descriptor returned by a previous call to :c:func:`open()`.
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``msg``
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Pointer to struct :c:type:`ca_descr`.
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Description
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-----------
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CA_SET_DESCR is used for feeding descrambler CA slots with descrambling
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keys (referred as control words).
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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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