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- .. -*- coding: utf-8; mode: rst -*-
- .. _VIDIOC_LOG_STATUS:
- ***********************
- ioctl VIDIOC_LOG_STATUS
- ***********************
- Name
- ====
- VIDIOC_LOG_STATUS - Log driver status information
- Synopsis
- ========
- .. c:function:: int ioctl( int fd, VIDIOC_LOG_STATUS)
- :name: VIDIOC_LOG_STATUS
- Arguments
- =========
- ``fd``
- File descriptor returned by :ref:`open() <func-open>`.
- Description
- ===========
- As the video/audio devices become more complicated it becomes harder to
- debug problems. When this ioctl is called the driver will output the
- current device status to the kernel log. This is particular useful when
- dealing with problems like no sound, no video and incorrectly tuned
- channels. Also many modern devices autodetect video and audio standards
- and this ioctl will report what the device thinks what the standard is.
- Mismatches may give an indication where the problem is.
- This ioctl is optional and not all drivers support it. It was introduced
- in Linux 2.6.15.
- 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.
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