On Fri, Jul 14, 2000 at 03:01:47PM +0200, Vasili Goutas wrote:
> daniel sheltraw wrote:
> >
> > Hello RT world
> >
> > Does a fifo have to be created (using rtf_create or equivalent) in
> > kernel-space before it can simply be opened for reading in user-space?
> Yes it has I think. What would youz read from it when nobody writes to
> it?
> A simple cat /dev/rtf0 tells you that there is no device like that,
> because no one created it.
The theory is that the fifo device is something you plug into the machine and
you "plug it in" by having a RT thread "create" the other end of the fifo. We've
thought about getting rid of this restriction, but it seems like a pointless feature
and
we are very cautious about adding features since simplicity and speed are the primary
value features of RTLinux.
>
>
> Vasili
>
> > The reason I ask is that I have been unable to open the /dev/rtf0 fifo in
> > user-space. I am actually running the user-space program as root
> > and the file permissions on the fifo device file are crw-r--r--.
> >
> > I am missing something simple. Please help. Thanks.
> >
> > Daniel
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