We plan to use rtlinux and gtk-- for the GUI.
There is GNU LPGL attached to both. Does that mean I have to release the
source code and make sure I don't charge anything for the software I
devolope?
Thanks
Andrew
----- Original Message -----
From: Phil Wilshire <[EMAIL PROTECTED]>
To: Thomas Eschenbacher <[EMAIL PROTECTED]>; RTL Group <>
Sent: Wednesday, March 08, 2000 1:34 PM
Subject: Re: [rtl] accessing device driver from user space
> Thomas Eschenbacher wrote:
> >
> > Hallo,
> >
> > is there any simple way to access an RT device driver from user space?
> >
> > My problem is that we have a C library that has to access a serial ports
> > /dev/ttyS0 through the "rt_com" driver.
> >
> > I use rtlinux-2.2, kernel-2.2.14/i386 and the rt_com-0.4. The kernel,
> > modules and examples work fine, even the examples in rt_com do work
> > (open the port, send bytes etc.). The device driver uses char-major-60
> > and the serial driver of the linux kernel is removed.
> > I did "rm /dev/ttyS0" and "mknod /dev/ttyS0 c 60 0".
> >
> > The example modules are able to call open("/dev/ttyS0", O_RDWR),
> > but if I copy this line to a sample program I always get -1 as return
> > value?
> >
> > can anybody explain me why???
> >
> > thanks,
> > Thomas.
> > --
> >
> Do a ls -l /dev/ttyS0
>
> The permissions may be set so that only root can open for read / write
>
> Regards
> phil Wilshire
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