audio-fwrite.rst 1.36 KB
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.audio
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.. _audio_fwrite:

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=========================
Digital TV audio write()
=========================
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Name
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----
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Digital TV audio write()
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.. attention:: This ioctl is deprecated
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Synopsis
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--------

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

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

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       -  void \*buf

       -  Pointer to the buffer containing the PES data.

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       -  size_t count

       -  Size of buf.

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Description
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-----------
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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.
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Return Value
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------------

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       -  ``EPERM``

       -  Mode AUDIO_SOURCE_MEMORY not selected.

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       -  ``ENOMEM``

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

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       -  ``EBADF``

       -  fd is not a valid open file descriptor.