# dnssd Functions ## Topics ### Functions [`func DNSServiceSleepKeepalive(UnsafeMutablePointer!, DNSServiceFlags, Int32, UInt32, DNSServiceSleepKeepaliveReply!, UnsafeMutableRawPointer!) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceSleepKeepalive(_:_:_:_:_:_:)) [`func DNSServiceAttributeCreate() -> DNSServiceAttributeRef?`](/documentation/dnssd/DNSServiceAttributeCreate()) [`func DNSServiceAttributeDeallocate(DNSServiceAttributeRef)`](/documentation/dnssd/DNSServiceAttributeDeallocate(_:)) [`func DNSServiceAttributeSetAAAAPolicy(DNSServiceAttributeRef, DNSServiceAAAAPolicy) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceAttributeSetAAAAPolicy(_:_:)) [`func DNSServiceAttributeSetHostKeyHash(DNSServiceAttributeRef, UInt32) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceAttributeSetHostKeyHash(_:_:)) [`func DNSServiceAttributeSetTimestamp(DNSServiceAttributeRef, UInt32) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceAttributeSetTimestamp(_:_:)) [`func DNSServiceQueryRecordWithAttribute(UnsafeMutablePointer?, DNSServiceFlags, UInt32, UnsafePointer?, UInt16, UInt16, OpaquePointer?, DNSServiceQueryRecordReply?, UnsafeMutableRawPointer?) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceQueryRecordWithAttribute(_:_:_:_:_:_:_:_:_:)) [`func DNSServiceRegisterRecordWithAttribute(DNSServiceRef?, UnsafeMutablePointer?, DNSServiceFlags, UInt32, UnsafePointer?, UInt16, UInt16, UInt16, UnsafeRawPointer?, UInt32, DNSServiceAttributeRef?, DNSServiceRegisterRecordReply?, UnsafeMutableRawPointer?) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceRegisterRecordWithAttribute(_:_:_:_:_:_:_:_:_:_:_:_:_:)) [`func DNSServiceRegisterWithAttribute(UnsafeMutablePointer?, DNSServiceFlags, UInt32, UnsafePointer?, UnsafePointer?, UnsafePointer?, UnsafePointer?, UInt16, UInt16, UnsafeRawPointer?, DNSServiceAttributeRef?, DNSServiceRegisterReply?, UnsafeMutableRawPointer?) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceRegisterWithAttribute(_:_:_:_:_:_:_:_:_:_:_:_:_:)) [`func DNSServiceSendQueuedRequests(DNSServiceRef?) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceSendQueuedRequests(_:)) [`func DNSServiceUpdateRecordWithAttribute(DNSServiceRef?, DNSRecordRef?, DNSServiceFlags, UInt16, UnsafeRawPointer?, UInt32, DNSServiceAttributeRef?) -> DNSServiceErrorType`](/documentation/dnssd/DNSServiceUpdateRecordWithAttribute(_:_:_:_:_:_:_:)) --- 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)