Tim Waugh <twaugh@redhat.com> wrote:
On Wed, Oct 22, 2003 at 02:19:26AM -0700, Cherry Cortes wrote:
> We're having problem making the read() to /dev/parport0 work. The
> function always returns -1. We have tried recompiling the kernel
> (we're using 2.4.18-14) with CONFIG_PARPORT enabled but it does not
> seem to work. We also set the mode to ECP and direction to
> reverse. Could you help us with this?
You'll need to check errno to see what the actual error is. read()
from that device can return several errors, including:
EINVAL
ENOMEM
EFAULT
If you're getting EINVAL, make sure you have actually claimed the port
first.
Tim.
*/
errno was EAGAIN and call to PPCLAIM was successful.
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