# CFMessagePortCreateLocal(_:_:_:_:_:) Returns a local CFMessagePort object. ``` func CFMessagePortCreateLocal(_ allocator: CFAllocator!, _ name: CFString!, _ callout: CFMessagePortCallBack!, _ context: UnsafeMutablePointer!, _ shouldFreeInfo: UnsafeMutablePointer!) -> CFMessagePort! ``` ## Parameters `allocator` The allocator to use to allocate memory for the new object. Pass `NULL` or kCFAllocatorDefault to use the current default allocator. `name` The name with which to register the port. `name` can be `NULL`. `callout` The callback function invoked when a message is received on the message port. `context` A structure holding contextual information for the message port. The function copies the information out of the structure, so the memory pointed to by `context` does not need to persist beyond the function call. `shouldFreeInfo` A flag set by the function to indicate whether the `info` member of `context` should be freed. The flag is set to `true` on failure or if a local port named `name` already exists, `false` otherwise. `shouldFreeInfo` can be `NULL`. ## Return Value The new CFMessagePort object, or `NULL` on failure. If a local port is already named `name`, the function returns that port instead of creating a new object; the `context` and `callout` parameters are ignored in this case. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029). ## Discussion This method is not available on iOS 7 and later—it will return `NULL` and log a sandbox violation in `syslog`. See [Concurrency Programming Guide](https://developer.apple.com/library/archive/documentation/General/Conceptual/ConcurrencyProgrammingGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40008091) for possible replacement technologies. --- 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)