# CFSocketCopyRegisteredValue(_:_:_:_:_:) Returns a value registered with a CFSocket name server. ``` func CFSocketCopyRegisteredValue(_ nameServerSignature: UnsafePointer!, _ timeout: CFTimeInterval, _ name: CFString!, _ value: UnsafeMutablePointer?>!, _ nameServerAddress: UnsafeMutablePointer?>!) -> CFSocketError ``` ## Parameters `nameServerSignature` The socket signature for the name server. If `NULL`, this function contacts the default server, which is assumed to be a local process using TCP/IP to listen on the port number returned from [`CFSocketGetDefaultNameRegistryPortNumber()`](/documentation/CoreFoundation/CFSocketGetDefaultNameRegistryPortNumber()). If `nameServerSignature` is incomplete, the missing values are replaced with the default server’s values, if appropriate. `timeout` The time to wait for the server to accept a connection and to reply to the registration request. `name` The name of the registered value to return. `value` A pointer to the property list object into which the retrieved value should be copied. `nameServerAddress` A pointer to a CFData object into which the name server’s address is copied. Pass `NULL` if you do not want the server’s address. ## Return Value An error code indicating success or failure. ## Discussion --- 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)