0001 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
0002 .. c:namespace:: DTV.ca
0003
0004 .. _CA_SET_DESCR:
0005
0006 ============
0007 CA_SET_DESCR
0008 ============
0009
0010 Name
0011 ----
0012
0013 CA_SET_DESCR
0014
0015 Synopsis
0016 --------
0017
0018 .. c:macro:: CA_SET_DESCR
0019
0020 ``int ioctl(fd, CA_SET_DESCR, struct ca_descr *desc)``
0021
0022 Arguments
0023 ---------
0024
0025 ``fd``
0026 File descriptor returned by a previous call to :c:func:`open()`.
0027
0028 ``msg``
0029 Pointer to struct :c:type:`ca_descr`.
0030
0031 Description
0032 -----------
0033
0034 CA_SET_DESCR is used for feeding descrambler CA slots with descrambling
0035 keys (referred as control words).
0036
0037 Return Value
0038 ------------
0039
0040 On success 0 is returned.
0041
0042 On error -1 is returned, and the ``errno`` variable is set
0043 appropriately.
0044
0045 Generic error codes are described at the
0046 :ref:`Generic Error Codes <gen-errors>` chapter.
