This chapter describes how to write a notifier for CUPS and how the
mailto notifier works.
Notifiers are programs that send IPP notifications via various protocols. CUPS provides notifier programs for the
mailto protocols. The
ippget protocol is implemented as an internal method because it uses an HTTP connection from the recipient.
Notifiers are fairly simple programs and merely need to read IPP event messages and send them to the recipient. The CUPS API includes functions for reading and decoding these messages.
Notification and notifier support is available starting with CUPS 1.2.
Each notifier program uses a common interface. Notifiers are ...