xpc(3)							   BSD Library Functions Manual 						    xpc(3)

NAME

     xpc -- a structured, asynchronous interprocess communication library

SYNOPSIS

     #include <xpc/xpc.h>

DESCRIPTION

     The XPC framework facilitates interprocess communication using structured messages. Messages are structured using property list style objects
     such as dictionaries, arrays, strings, integers and UUIDs. Out-of-line types such as file descriptors and shared memory regions are also sup-
     ported. The root object of each message is a dictionary.

     Messages are sent via connections created using xpc_connection_create(3) and xpc_connection_create_mach_service(3).

     XPC significantly leverages the on-demand process management features of launchd(8) to provide transparent process life-cycle management.	As
     such, clients of the XPC framework have little to no responsibility for managing their corresponding service processes.

     Consequently, there is no facility in XPC to directly query the execution status of a service. XPC services are simply made available when
     they are needed, so clients needn't be concerned with remote process state.

     Dynamic service registrations (ala bootstrap_register(), bootstrap_create_service() and bootstrap_create_server()) are also purposefully dis-
     allowed.

     XPC's integration with launchd(8) also extends to being able to launch jobs on-demand with higher-level events than have been historically
     available. Using XPC and launchd together, jobs can be launched based on events in IOKit or the posting of BSD Notifications.

SEE ALSO

     xpc_object(3), xpc_main(3), xpc_connection_create(3), xpc_connection_create_mach_service(3), xpc_dictionary_create(3), xpc_array_create(3),
     xpc_objects(3), xpc_events(3), xpc_abort(3), xpcproxy(8), notify(3), launchd(8)

Darwin								   1 July, 2011 							    Darwin