[cups.development] backend back channel response

[Guillaume Giroux]

Hi,

I am printing to a ticket printer in raw socket mode and I 
need to read the printer's output after a print job has been 
sent, to be 100% sure that the ticket/label has been printed.

So, is there an API way to get the back channel data with the
'socket' backend? I see in socket.c there is some debugging 
output of the number of bytes read from the printer, but I 
cannot find a way to get this data back to my program which 
launched the print job using cupsPrintFile(). 

Thanks for any advice/pointer,
Guillaume