Documentation/media/uapi/dvb/ca-get-msg.rst

.. -*- coding: utf-8; mode: rst -*-

.. _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.