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1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later2.. c:namespace:: DTV.ca3 4.. _CA_SET_DESCR:5 6============7CA_SET_DESCR8============9 10Name11----12 13CA_SET_DESCR14 15Synopsis16--------17 18.. c:macro:: CA_SET_DESCR19 20``int ioctl(fd, CA_SET_DESCR, struct ca_descr *desc)``21 22Arguments23---------24 25``fd``26 File descriptor returned by a previous call to :c:func:`open()`.27 28``msg``29 Pointer to struct :c:type:`ca_descr`.30 31Description32-----------33 34CA_SET_DESCR is used for feeding descrambler CA slots with descrambling35keys (referred as control words).36 37Return Value38------------39 40On success 0 is returned.41 42On error -1 is returned, and the ``errno`` variable is set43appropriately.44 45Generic error codes are described at the46:ref:`Generic Error Codes <gen-errors>` chapter.47