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porting driver and apps containing ioctl() calls
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dnewbold
Post subject: porting driver and apps containing ioctl() calls  PostPosted: May 17, 2007 - 04:20 PM
Guest
porting driver and apps containing ioctl() calls

QNX 6.3 translates application ioctl() calls to resource manager devctl
messages.
When the ioctl() "arg" parameter passes data via a pointer all goes well.
In these cases the data is accessed via the C code "void* data =
_DEVCTL_DATA(msg->i);."
However, I've not found how the access the ioctl() "arg" parameter when it
is a discrete value rather than a pointer.

Any help would be appreciated.

Don
 
   
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kwschumm
Post subject: Re: porting driver and apps containing ioctl() calls  PostPosted: May 18, 2007 - 12:54 AM
Senior Member


Joined: Sep 17, 2004
Posts: 207
"dnewbold" <dnewbold@generalstandards.com> wrote in message
news:f2hv03$75j$2@inn.qnx.com...
Quote:
porting driver and apps containing ioctl() calls

QNX 6.3 translates application ioctl() calls to resource manager devctl
messages.
When the ioctl() "arg" parameter passes data via a pointer all goes well.
In these cases the data is accessed via the C code "void* data =
_DEVCTL_DATA(msg->i);."
However, I've not found how the access the ioctl() "arg" parameter when it
is a discrete value rather than a pointer.

Any help would be appreciated.

In a driver we do something like this:

int *datap, data ;

datap = (int *) _DEVCTL_DATA(msg->i);
data = *datap ;
 
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David Gibbs
Post subject: Re: porting driver and apps containing ioctl() calls  PostPosted: May 18, 2007 - 01:29 PM
Guest
dnewbold <dnewbold@generalstandards.com> wrote:
Quote:
porting driver and apps containing ioctl() calls

QNX 6.3 translates application ioctl() calls to resource manager devctl
messages.
When the ioctl() "arg" parameter passes data via a pointer all goes well.
In these cases the data is accessed via the C code "void* data =
_DEVCTL_DATA(msg->i);."
However, I've not found how the access the ioctl() "arg" parameter when it
is a discrete value rather than a pointer.

Hm... devctl() takes all data as a "void *". Maybe pass the address of the
arg parameter to ioctl?

-David
--
David Gibbs
QNX Training Services
dagibbs@qnx.com
 
   
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