Em 07-07-2011 12:29, Hans Verkuil escreveu:
> On Wednesday, July 06, 2011 20:03:52 Mauro Carvalho Chehab wrote:
>> Instead of having their own generic error codes at the MC API, move
>> its section to the generic one and be sure that all media ioctl's
>> will point to it.
>>
>> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
>>
>> diff --git a/Documentation/DocBook/media/v4l/gen-errors.xml b/Documentation/DocBook/media/v4l/gen-errors.xml
>> index 6ef476a..a7f73c9 100644
>> --- a/Documentation/DocBook/media/v4l/gen-errors.xml
>> +++ b/Documentation/DocBook/media/v4l/gen-errors.xml
>> @@ -5,6 +5,11 @@
>> <tgroup cols="2">
>> &cs-str;
>> <tbody valign="top">
>> + <!-- Keep it ordered alphabetically -->
>> + <row>
>> + <entry>EBADF</entry>
>> + <entry><parameter>fd</parameter> is not a valid open file descriptor.</entry>
>> + </row>
>> <row>
>> <entry>EBUSY</entry>
>> <entry>The ioctl can't be handled because the device is busy. This is
>> @@ -15,7 +20,16 @@
>> problem first (typically: stop the stream before retrying).</entry>
>> </row>
>> <row>
>> + <entry>EFAULT</entry>
>> + <entry><parameter>fd</parameter> is not a valid open file descriptor.</entry>
>
> This seems to be a copy-and-paste error. The original text in media-func-ioctl.xml says this:
>
> <para><parameter>argp</parameter> references an inaccessible memory
> area.</para>
Ah, yes. Anyway, a latter patch changes it to:
<entry>EFAULT</entry>
<entry>There was a failure while copying data from/to userspace.</entry>
</row>
referencing a parameter name there is a bad thing anyway, as this is now at the common
ioctl error code.
Instead of just using a posix-like error code:
EFAULT Bad address (POSIX.1)
I opted to use a more valuable description, explaining the reason for such error,
e. g. that there was a failure at the data copy from/to userspace.
It may be better to change it to:
<entry>EFAULT</entry>
<entry>There was a failure while copying data from/to userspace, probably
caused by an invalid pointer reference.</entry>
I think I'll add the above description at the latter patch.
I was intending to add there the other possible error causes found at V4L/DVB API's
and drivers, but the changes I did took me a longer time than I was expecting
originally. I'll eventually do that when I have more time.
It would be really great if we could find some volunteer to help syncing
the media API specs with the code.
>> + </row>
>> + <row>
>> <entry>EINVAL</entry>
>> + <entry>One or more of the ioctl parameters are invalid. This is a widely
>
> widely -> widely used
>
>> + error code. see the individual ioctl requests for actual causes.</entry>
>
> see -> See
Fixed.
Thanks!
Mauro
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