.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

.. _audio_fwrite:

=========================
Digital TV audio write()
=========================

Name
----

Digital TV audio write()

.. attention:: This ioctl is deprecated

Synopsis
--------

.. c:function:: size_t write(int fd, const void *buf, size_t count)
    :name: dvb-audio-write


Arguments
---------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  void \*buf

       -  Pointer to the buffer containing the PES data.

    -  .. row 3

       -  size_t count

       -  Size of buf.


Description
-----------

This system call can only be used if AUDIO_SOURCE_MEMORY is selected
in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in
PES format. If O_NONBLOCK is not specified the function will block
until buffer space is available. The amount of data to be transferred is
implied by count.


Return Value
------------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  ``EPERM``

       -  Mode AUDIO_SOURCE_MEMORY not selected.

    -  .. row 2

       -  ``ENOMEM``

       -  Attempted to write more data than the internal buffer can hold.

    -  .. row 3

       -  ``EBADF``

       -  fd is not a valid open file descriptor.