# DriverKit Structures ## Topics ### Structures [`struct IODMACommandSpecification;`](/documentation/DriverKit/IODMACommandSpecification) [`typedef struct { ... } IOHistogramReportValues;`](/documentation/DriverKit/IOHistogramReportValues) [`typedef struct { ... } IOHistogramSegmentConfig;`](/documentation/DriverKit/IOHistogramSegmentConfig) [`typedef struct { ... } IONormDistReportValues;`](/documentation/DriverKit/IONormDistReportValues) [`struct IORPCMessageErrorReturnContent;`](/documentation/DriverKit/IORPCMessageErrorReturnContent) [`typedef struct { ... } IOReportChannel;`](/documentation/DriverKit/IOReportChannel) [`typedef struct { ... } IOReportChannelList;`](/documentation/DriverKit/IOReportChannelList) [`typedef struct { ... } IOReportChannelType;`](/documentation/DriverKit/IOReportChannelType) [`typedef struct { ... } IOReportElement;`](/documentation/DriverKit/IOReportElement) [`typedef struct { ... } IOReportElementValues;`](/documentation/DriverKit/IOReportElementValues) [`typedef struct { ... } IOReportInterest;`](/documentation/DriverKit/IOReportInterest) [`typedef struct { ... } IOReportInterestList;`](/documentation/DriverKit/IOReportInterestList) [`typedef struct { ... } IOSimpleArrayReportValues;`](/documentation/DriverKit/IOSimpleArrayReportValues) [`typedef struct { ... } IOSimpleReportValues;`](/documentation/DriverKit/IOSimpleReportValues) [`typedef struct { ... } IOStateReportValues;`](/documentation/DriverKit/IOStateReportValues) [`template struct OSSharedPtr;`](/documentation/DriverKit/OSSharedPtr) [`typedef struct SCSICmd_INQUIRY_Page00_Header { ... } SCSICmd_INQUIRY_Page00_Header;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page00_Header) [`typedef struct SCSICmd_INQUIRY_Page00_Header_SPC_16 { ... } SCSICmd_INQUIRY_Page00_Header_SPC_16;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page00_Header_SPC_16) [`typedef struct SCSICmd_INQUIRY_Page80_Header { ... } SCSICmd_INQUIRY_Page80_Header;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page80_Header) [`typedef struct SCSICmd_INQUIRY_Page80_Header_SPC_16 { ... } SCSICmd_INQUIRY_Page80_Header_SPC_16;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page80_Header_SPC_16) [`typedef struct SCSICmd_INQUIRY_Page83_Header { ... } SCSICmd_INQUIRY_Page83_Header;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_Header) [`typedef struct SCSICmd_INQUIRY_Page83_Header_SPC_16 { ... } SCSICmd_INQUIRY_Page83_Header_SPC_16;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_Header_SPC_16) [`typedef struct SCSICmd_INQUIRY_Page83_Identification_Descriptor { ... } SCSICmd_INQUIRY_Page83_Identification_Descriptor;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_Identification_Descriptor) [`typedef struct SCSICmd_INQUIRY_Page83_LogicalUnitGroup_Identifier { ... } SCSICmd_INQUIRY_Page83_LogicalUnitGroup_Identifier;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_LogicalUnitGroup_Identifier) [`typedef struct SCSICmd_INQUIRY_Page83_RelativeTargetPort_Identifier { ... } SCSICmd_INQUIRY_Page83_RelativeTargetPort_Identifier;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_RelativeTargetPort_Identifier) [`typedef struct SCSICmd_INQUIRY_Page83_TargetPortGroup_Identifier { ... } SCSICmd_INQUIRY_Page83_TargetPortGroup_Identifier;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page83_TargetPortGroup_Identifier) [`typedef struct SCSICmd_INQUIRY_Page89_Data { ... } SCSICmd_INQUIRY_Page89_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_Page89_Data) [`typedef struct SCSICmd_INQUIRY_PageB0_Data { ... } SCSICmd_INQUIRY_PageB0_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageB0_Data) [`typedef struct SCSICmd_INQUIRY_PageB1_Data { ... } SCSICmd_INQUIRY_PageB1_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageB1_Data) [`typedef struct SCSICmd_INQUIRY_PageB2_Data { ... } SCSICmd_INQUIRY_PageB2_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageB2_Data) [`typedef struct SCSICmd_INQUIRY_PageB2_Provisioning_Group_Descriptor { ... } SCSICmd_INQUIRY_PageB2_Provisioning_Group_Descriptor;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageB2_Provisioning_Group_Descriptor) [`typedef struct SCSICmd_INQUIRY_PageC0_Data { ... } SCSICmd_INQUIRY_PageC0_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageC0_Data) [`typedef struct SCSICmd_INQUIRY_PageC1_Data { ... } SCSICmd_INQUIRY_PageC1_Data;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageC1_Data) [`struct SCSICmd_INQUIRY_PageCx_Header;`](/documentation/DriverKit/SCSICmd_INQUIRY_PageCx_Header-c.struct) [`typedef struct SCSICmd_INQUIRY_StandardData { ... } SCSICmd_INQUIRY_StandardData;`](/documentation/DriverKit/SCSICmd_INQUIRY_StandardData) [`typedef struct SCSICmd_INQUIRY_StandardDataAll { ... } SCSICmd_INQUIRY_StandardDataAll;`](/documentation/DriverKit/SCSICmd_INQUIRY_StandardDataAll) [`typedef struct SCSI_Capacity_Data { ... } SCSI_Capacity_Data;`](/documentation/DriverKit/SCSI_Capacity_Data) [`typedef struct SCSI_Capacity_Data_Long { ... } SCSI_Capacity_Data_Long;`](/documentation/DriverKit/SCSI_Capacity_Data_Long) [`typedef struct SCSI_Sense_Data { ... } SCSI_Sense_Data;`](/documentation/DriverKit/SCSI_Sense_Data) [`struct mach_timebase_info;`](/documentation/DriverKit/mach_timebase_info-c.struct) [`struct queue_entry;`](/documentation/DriverKit/queue_entry) [`typedef struct queue_entry queue_head_t;`](/documentation/DriverKit/queue_head_t) --- Copyright © 2026 Apple Inc. 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