diff options
Diffstat (limited to 'Documentation/media/uapi/mediactl/media-func-ioctl.rst')
| -rw-r--r-- | Documentation/media/uapi/mediactl/media-func-ioctl.rst | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/Documentation/media/uapi/mediactl/media-func-ioctl.rst b/Documentation/media/uapi/mediactl/media-func-ioctl.rst deleted file mode 100644 index 9a990d6480f5..000000000000 --- a/Documentation/media/uapi/mediactl/media-func-ioctl.rst +++ /dev/null @@ -1,74 +0,0 @@ -.. Permission is granted to copy, distribute and/or modify this -.. document under the terms of the GNU Free Documentation License, -.. Version 1.1 or any later version published by the Free Software -.. Foundation, with no Invariant Sections, no Front-Cover Texts -.. and no Back-Cover Texts. A copy of the license is included at -.. Documentation/media/uapi/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections - -.. _media-func-ioctl: - -************* -media ioctl() -************* - -Name -==== - -media-ioctl - Control a media device - - -Synopsis -======== - -.. code-block:: c - - #include <sys/ioctl.h> - - -.. c:function:: int ioctl( int fd, int request, void *argp ) - :name: mc-ioctl - -Arguments -========= - -``fd`` - File descriptor returned by :c:func:`open() <mc-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. |