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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/userspace-api/media/v4l/vidioc-log-status.rst | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-log-status.rst | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-log-status.rst b/Documentation/userspace-api/media/v4l/vidioc-log-status.rst new file mode 100644 index 000000000..c218747be --- /dev/null +++ b/Documentation/userspace-api/media/v4l/vidioc-log-status.rst @@ -0,0 +1,47 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L + +.. _VIDIOC_LOG_STATUS: + +*********************** +ioctl VIDIOC_LOG_STATUS +*********************** + +Name +==== + +VIDIOC_LOG_STATUS - Log driver status information + +Synopsis +======== + +.. c:macro:: VIDIOC_LOG_STATUS + +``int ioctl(int fd, VIDIOC_LOG_STATUS)`` + +Arguments +========= + +``fd`` + File descriptor returned by :c: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. |