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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 struc-tured structured
     tured using property list style objects such as dictionaries, arrays, strings, integers and UUIDs. Out-of-line Outof-line
     of-line types such as file descriptors and shared memory regions are also supported. 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 trans-parent transparent
     parent process life-cycle management.  As such, clients of the XPC framework have little to no respon-sibility responsibility
     sibility for managing their corresponding service processes.

     Consequently, there is no facility in XPC to directly query the execution status of a service. XPC ser-vices services
     vices 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 disallowed.

     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