xpc(3) BSD Library Functions Manual xpc(3)NAMExpc — 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 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 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 pur‐
posefully 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 ALSOxpc_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
