CUPS 1.2 and bidirectional communications

[Vladimir Buzuev]

OK, thanks. And the last question, CUPS 1.1.23 filters do not support reading from descriptor 3, do they?

Vladimir

> Vladimir Buzuev wrote:
> > More information:
> >
> > I need another sort of filter works between my ordinal raster filter
> > and the backend. The filter should be able to request some
> > information from the printer, like a status, and based on that do
> > some additional processing of sending data. Is it possible? How to
> > read information returned by the printer?
>
> In the (nearish) future, we will have the backchannel API stuff
> committed to the repo (and thus be part of a future snapshot) which
> will allow you to safely read backchannel data with a timeout, such
> that your filter will not hang when printing through an interface
> that does not support backchannel data (i.e. anything except socket,
> usb, serial, and in some cases parallel)
>
> Right now you just have to read from file descriptor 3 to get the
> backchannel data.
>
> --
> ______________________________________________________________________
> Michael Sweet, Easy Software Products           mike at easysw dot com
> Internet Printing and Document Software          http://www.easysw.com