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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:40:06 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:59:40 -0300 |
commit | 60c2820d0f6d3497975b6488e2599f8f611d8b95 (patch) | |
tree | b3b03707c6438ea9b99cc57e847ebf517f968ab1 /Documentation/media/uapi/mediactl/media-func-ioctl.rst | |
parent | a97369b5e21ea9b8b5fef7c0f4f48bbe60c07ca3 (diff) | |
download | op-kernel-dev-60c2820d0f6d3497975b6488e2599f8f611d8b95.zip op-kernel-dev-60c2820d0f6d3497975b6488e2599f8f611d8b95.tar.gz |
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>
Diffstat (limited to 'Documentation/media/uapi/mediactl/media-func-ioctl.rst')
-rw-r--r-- | Documentation/media/uapi/mediactl/media-func-ioctl.rst | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/Documentation/media/uapi/mediactl/media-func-ioctl.rst b/Documentation/media/uapi/mediactl/media-func-ioctl.rst new file mode 100644 index 0000000..9d1b231 --- /dev/null +++ b/Documentation/media/uapi/mediactl/media-func-ioctl.rst @@ -0,0 +1,67 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _media-func-ioctl: + +************* +media ioctl() +************* + +Name +==== + +media-ioctl - Control a media device + + +Synopsis +======== + +.. code-block:: c + + #include <sys/ioctl.h> + + +.. cpp:function:: int ioctl( int fd, int request, void *argp ) + + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() <func-open>`. + +``request`` + Media ioctl request code as defined in the media.h header file, for + example MEDIA_IOC_SETUP_LINK. + +``argp`` + Pointer to a request-specific structure. + + +Description +=========== + +The :ref:`ioctl() <media-func-ioctl>` function manipulates media device +parameters. The argument ``fd`` must be an open file descriptor. + +The ioctl ``request`` code specifies the media function to be called. It +has encoded in it whether the argument is an input, output or read/write +parameter, and the size of the argument ``argp`` in bytes. + +Macros and structures definitions specifying media ioctl requests and +their parameters are located in the media.h header file. All media ioctl +requests, their respective function and parameters are specified in +:ref:`media-user-func`. + + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +Request-specific error codes are listed in the individual requests +descriptions. + +When an ioctl that takes an output or read/write parameter fails, the +parameter remains unmodified. |