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linux-next/Documentation/media/uapi/dvb/video-fwrite.rst
Mauro Carvalho Chehab 60c2820d0f doc_rst: rename the media Sphinx suff to Documentation/media
The name of the subsystem is "media", and not "linux_tv". Also,
as we plan to add other stuff there in the future, let's
rename also the media uAPI book to media_uapi, to make it
clearer.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-08 11:59:40 -03:00

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.. -*- coding: utf-8; mode: rst -*-
.. _video_fwrite:
=================
dvb video write()
=================
Name
----
dvb video write()
Synopsis
--------
.. cpp:function:: size_t write(int fd, const void *buf, size_t count)
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 VIDEO_SOURCE_MEMORY is selected
in the ioctl call VIDEO_SELECT_SOURCE. The data provided shall be in
PES format, unless the capability allows other formats. 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::
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:stub-columns: 0
- .. row 1
- ``EPERM``
- Mode VIDEO_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.