* [Xenomai-help] Accessing the dev_private field of the RTDM driver context
@ 2006-02-22 13:29 Jeroen Van den Keybus
2006-02-22 13:42 ` Jan Kiszka
0 siblings, 1 reply; 3+ messages in thread
From: Jeroen Van den Keybus @ 2006-02-22 13:29 UTC (permalink / raw)
To: xenomai@xenomai.org
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The dev_private data field of an rtdm_dev_context is defined as char[0]. How
do I access such a field properly (given the fact that I defined a nonzero
context_size in the rtdm_device structure during driver registration) ?
E.g. trying to do:
(struct my_struct *)context->dev_private = NULL;
results in:
error: incompatible types in assignment
I _am_ able to compare though:
if ((struct my_struct *)context->dev_private == NULL)
...
seems to compile fine.
Jeroen.
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* Re: [Xenomai-help] Accessing the dev_private field of the RTDM driver context
2006-02-22 13:29 [Xenomai-help] Accessing the dev_private field of the RTDM driver context Jeroen Van den Keybus
@ 2006-02-22 13:42 ` Jan Kiszka
2006-02-22 14:29 ` Jeroen Van den Keybus
0 siblings, 1 reply; 3+ messages in thread
From: Jan Kiszka @ 2006-02-22 13:42 UTC (permalink / raw)
To: Jeroen Van den Keybus; +Cc: xenomai@xenomai.org
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Jeroen Van den Keybus wrote:
> The dev_private data field of an rtdm_dev_context is defined as char[0]. How
> do I access such a field properly (given the fact that I defined a nonzero
> context_size in the rtdm_device structure during driver registration) ?
>
> E.g. trying to do:
>
> (struct my_struct *)context->dev_private = NULL;
>
> results in:
>
> error: incompatible types in assignment
>
> I _am_ able to compare though:
>
> if ((struct my_struct *)context->dev_private == NULL)
> ...
>
> seems to compile fine.
>
>
> Jeroen.
>
context->dev_private does not contain an address, it IS the start
address of your private date. It's size is specified during device
registration. See existing drivers for usage examples.
Jan
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* Re: [Xenomai-help] Accessing the dev_private field of the RTDM driver context
2006-02-22 13:42 ` Jan Kiszka
@ 2006-02-22 14:29 ` Jeroen Van den Keybus
0 siblings, 0 replies; 3+ messages in thread
From: Jeroen Van den Keybus @ 2006-02-22 14:29 UTC (permalink / raw)
To: Jan Kiszka; +Cc: xenomai@xenomai.org
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Indeed. Thanks and sorry for bothering.
Jeroen.
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2006-02-22 13:29 [Xenomai-help] Accessing the dev_private field of the RTDM driver context Jeroen Van den Keybus
2006-02-22 13:42 ` Jan Kiszka
2006-02-22 14:29 ` Jeroen Van den Keybus
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