Module blocking

CUPS’s calls themselves, for a program without ltk’s loop; each blocks.

Functions

• cancel
• jobs
  The user’s jobs not yet finished, on every printer or on printer.
• print
  Sends pdf as one job; the job’s id.
• printers
  The queues and the printers found on the network, the default first.
• set_default
  The user’s default printer, kept by CUPS in their lpoptions.