1059b1c5bSMauro Carvalho Chehab.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2407e84cdSMauro Carvalho Chehab.. c:namespace:: V4L 354f38fcaSMauro Carvalho Chehab 454f38fcaSMauro Carvalho Chehab.. _VIDIOC_LOG_STATUS: 554f38fcaSMauro Carvalho Chehab 654f38fcaSMauro Carvalho Chehab*********************** 754f38fcaSMauro Carvalho Chehabioctl VIDIOC_LOG_STATUS 854f38fcaSMauro Carvalho Chehab*********************** 954f38fcaSMauro Carvalho Chehab 1054f38fcaSMauro Carvalho ChehabName 1154f38fcaSMauro Carvalho Chehab==== 1254f38fcaSMauro Carvalho Chehab 1354f38fcaSMauro Carvalho ChehabVIDIOC_LOG_STATUS - Log driver status information 1454f38fcaSMauro Carvalho Chehab 1554f38fcaSMauro Carvalho ChehabSynopsis 1654f38fcaSMauro Carvalho Chehab======== 1754f38fcaSMauro Carvalho Chehab 18407e84cdSMauro Carvalho Chehab.. c:macro:: VIDIOC_LOG_STATUS 1954f38fcaSMauro Carvalho Chehab 20407e84cdSMauro Carvalho Chehab``int ioctl(int fd, VIDIOC_LOG_STATUS)`` 2154f38fcaSMauro Carvalho Chehab 2254f38fcaSMauro Carvalho ChehabArguments 2354f38fcaSMauro Carvalho Chehab========= 2454f38fcaSMauro Carvalho Chehab 2554f38fcaSMauro Carvalho Chehab``fd`` 26407e84cdSMauro Carvalho Chehab File descriptor returned by :c:func:`open()`. 2754f38fcaSMauro Carvalho Chehab 2854f38fcaSMauro Carvalho ChehabDescription 2954f38fcaSMauro Carvalho Chehab=========== 3054f38fcaSMauro Carvalho Chehab 3154f38fcaSMauro Carvalho ChehabAs the video/audio devices become more complicated it becomes harder to 3254f38fcaSMauro Carvalho Chehabdebug problems. When this ioctl is called the driver will output the 3354f38fcaSMauro Carvalho Chehabcurrent device status to the kernel log. This is particular useful when 3454f38fcaSMauro Carvalho Chehabdealing with problems like no sound, no video and incorrectly tuned 3554f38fcaSMauro Carvalho Chehabchannels. Also many modern devices autodetect video and audio standards 3654f38fcaSMauro Carvalho Chehaband this ioctl will report what the device thinks what the standard is. 3754f38fcaSMauro Carvalho ChehabMismatches may give an indication where the problem is. 3854f38fcaSMauro Carvalho Chehab 3954f38fcaSMauro Carvalho ChehabThis ioctl is optional and not all drivers support it. It was introduced 4054f38fcaSMauro Carvalho Chehabin Linux 2.6.15. 4154f38fcaSMauro Carvalho Chehab 4254f38fcaSMauro Carvalho ChehabReturn Value 4354f38fcaSMauro Carvalho Chehab============ 4454f38fcaSMauro Carvalho Chehab 4554f38fcaSMauro Carvalho ChehabOn success 0 is returned, on error -1 and the ``errno`` variable is set 4654f38fcaSMauro Carvalho Chehabappropriately. The generic error codes are described at the 4754f38fcaSMauro Carvalho Chehab:ref:`Generic Error Codes <gen-errors>` chapter. 48