IoGetConfigurationInformation function (ntifs.h)

The IoGetConfigurationInformation routine returns a pointer to the I/O manager's global configuration information structure, which contains the current values for how many physical disk, floppy, CD-ROM, tape, SCSI HBA, serial, and parallel devices have device objects created to represent them by drivers as they are loaded.

Syntax

PCONFIGURATION_INFORMATION IoGetConfigurationInformation();

Return value

IoGetConfigurationInformation returns a pointer to a CONFIGURATION_INFORMATION structure.

Remarks

Certain types of device drivers can use the configuration information structure's values to construct device object names with appropriate digit suffixes when each driver creates its device objects. Note that the digit suffix for device object names is a zero-based count, while the counts maintained in the configuration information structure represent the number of device objects of a particular type already created. That is, the configuration information counts are one-based.

Any driver that calls IoGetConfigurationInformation must increment the count for its kind of device in this structure when it creates a device object to represent a physical device.

The system-supplied SCSI port driver supplies the count of SCSI HBAs present in the computer. SCSI class drivers can read this value to determine how many HBA-specific miniport drivers might control a SCSI bus with an attached device of the class driver's type.

The configuration information structure also contains a value indicating whether an already loaded driver has claimed either of the "AT" disk I/O address ranges.

Requirements

Requirement	Value
Minimum supported client	Windows 2000
Target Platform	Universal
Header	ntifs.h (include Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	PASSIVE_LEVEL
DDI compliance rules	HwStorPortProhibitedDDIs(storport), IrqlIoPassive5(wdm), PowerIrpDDis(wdm)

See also

HalAssignSlotResources

HalGetBusData

HalGetBusDataByOffset

IoAssignResources

IoQueryDeviceDescription

IoReportResourceUsage