In short, you can't open a file or device in kernel space. You have to open
it in a user-space task and then open an RT-FIFO between the user-task and
your module. You can then put all of the data to be written/transmitted
into the FIFO in the module and
get in user-space where it's easy to deal with.
Norm
> -----Original Message-----
> From: Bertrand Croq [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, June 27, 2000 9:41 AM
> To: [EMAIL PROTECTED]
> Subject: [rtl] Opening a device
>
> Hi,
> I don't know if my problem is specific to RTLinux (I don't think so),
> but maybe someone has an answer: I want to use RTLinux to write data to
> a device (/dev/ttyI*). So I write a module that create a "periodic"
> thread; in this thread, I try to open the device, but the open()
> function always tells me "bad file or directory"... I have tried with a
> simple file and I also get the error!
> This is the first time I write a kernel module and I don't really know
> what functions can be used and when, so I would like to know how to open
> a file/device while in kernel space.
>
> Thanks in advance.
>
> - Bertrand Croq
>
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