From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 22 Feb 2006 14:42:15 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-help] Accessing the dev_private field of the RTDM driver
	context
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To: Jeroen Van den Keybus <jeroen.vandenkeybus@domain.hid>
Cc: "xenomai@xenomai.org" <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]=
=2E How
> do I access such a field properly (given the fact that I defined a nonz=
ero
> context_size in the rtdm_device structure during driver registration) ?=

>=20
> E.g. trying to do:
>=20
> (struct my_struct *)context->dev_private =3D NULL;
>=20
> results in:
>=20
> error: incompatible types in assignment
>=20
> I _am_ able to compare though:
>=20
> if ((struct my_struct *)context->dev_private =3D=3D NULL)
> ...
>=20
> seems to compile fine.
>=20
>=20
> Jeroen.
>=20

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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