# xpc_listener_t A C type that performs tasks for clients across process boundaries. ``` typealias xpc_listener_t = OS_xpc_listener ``` ## Discussion To implement an XPC service, create a listener and respond to incoming session requests. ## Topics ### Creating a listener [`extern xpc_listener_txpc_listener_create(const char *service, dispatch_queue_t target_queue, xpc_listener_create_flags_t flags, xpc_listener_incoming_session_handler_t incoming_session_handler, xpc_rich_error_t*error_out);`](/documentation/XPC/xpc_listener_create) Creates the server side of an XPC service using the specified service name. [`typedef enum { ... } xpc_listener_create_flags_t;`](/documentation/XPC/xpc_listener_create_flags_t) Options that control the listener’s configuration. [`typealias xpc_listener_incoming_session_handler_t`](/documentation/XPC/xpc_listener_incoming_session_handler_t) A block that receives an incoming peer session request from a client. [`extern char *xpc_listener_copy_description(xpc_listener_t listener);`](/documentation/XPC/xpc_listener_copy_description) Copies the description string of a listener. ### Managing the life cycle [`extern bool xpc_listener_activate(xpc_listener_t listener, xpc_rich_error_t*error_out);`](/documentation/XPC/xpc_listener_activate) Activates an inactive listener. [`extern void xpc_listener_cancel(xpc_listener_t listener);`](/documentation/XPC/xpc_listener_cancel) Cancels a listener. [`extern void xpc_listener_reject_peer(xpc_session_t peer, const char *reason);`](/documentation/XPC/xpc_listener_reject_peer) Rejects an incoming peer session request. ### Working with code signing [`func xpc_listener_set_peer_code_signing_requirement(xpc_listener_t, UnsafePointer) -> Int32`](/documentation/XPC/xpc_listener_set_peer_code_signing_requirement(_:_:)) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)