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| author | Hans Verkuil <hverkuil@xs4all.nl> | 2016-07-19 06:26:13 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-19 13:33:29 -0300 |
| commit | e5208ed280685947b3892888df09285676aab100 (patch) | |
| tree | 8518bdbaeb22f169a1fe4afd44107149d9784e4f /Documentation/media/uapi/cec/cec-ioc-dqevent.rst | |
| parent | ef88f10eb877c427a61c3aacc7ed08ffed0712ab (diff) | |
[media] doc-rst: cec: update documentation
Update and expand the CEC documentation. Especially w.r.t. non-blocking
mode.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media/uapi/cec/cec-ioc-dqevent.rst')
| -rw-r--r-- | Documentation/media/uapi/cec/cec-ioc-dqevent.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/media/uapi/cec/cec-ioc-dqevent.rst b/Documentation/media/uapi/cec/cec-ioc-dqevent.rst index 2785a4cb9f08..7a6d6d00ce19 100644 --- a/Documentation/media/uapi/cec/cec-ioc-dqevent.rst +++ b/Documentation/media/uapi/cec/cec-ioc-dqevent.rst @@ -38,7 +38,7 @@ Description CEC devices can send asynchronous events. These can be retrieved by calling :ref:`ioctl CEC_DQEVENT <CEC_DQEVENT>`. If the file descriptor is in non-blocking mode and no event is pending, then it will return -1 and -set errno to the EAGAIN error code. +set errno to the ``EAGAIN`` error code. The internal event queues are per-filehandle and per-event type. If there is no more room in a queue then the last event is overwritten with @@ -117,6 +117,8 @@ it is guaranteed that the state did change in between the two events. - ``ts`` - Timestamp of the event in ns. + The timestamp has been taken from the ``CLOCK_MONOTONIC`` clock. To access + the same clock from userspace use :c:func:`clock_gettime(2)`. - |