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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _CA_GET_MSG:
==========
CA_GET_MSG
==========
Name
----
CA_GET_MSG
Synopsis
--------
.. c:function:: int ioctl(fd, CA_GET_MSG, struct ca_msg *msg)
:name: CA_GET_MSG
Arguments
---------
``fd``
File descriptor returned by a previous call to :c:func:`open() <dvb-ca-open>`.
``msg``
Pointer to struct :c:type:`ca_msg`.
Description
-----------
Receives a message via a CI CA module.
.. note::
Please notice that, on most drivers, this is done by reading from
the /dev/adapter?/ca? device node.
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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