SENDCMDINPARAMS structure (ntdddisk.h)
The SENDCMDINPARAMS structure contains the input parameters for the SMART_SEND_DRIVE_COMMAND and SMART_RCV_DRIVE_DATA requests (see Remarks).
Syntax
typedef struct _SENDCMDINPARAMS {
ULONG cBufferSize;
IDEREGS irDriveRegs;
UCHAR bDriveNumber;
UCHAR bReserved[3];
ULONG dwReserved[4];
UCHAR bBuffer[1];
} SENDCMDINPARAMS, *PSENDCMDINPARAMS, *LPSENDCMDINPARAMS;
Members
cBufferSize
Contains the buffer size, in bytes.
irDriveRegs
Contains a IDEREGS structure used to report the contents of the IDE controller registers.
bDriveNumber
This member is opaque. Do not use it. The operating system ignores this member, because the physical drive that receives the request depends on the handle that the caller uses when making the request.
bReserved[3]
Reserved.
dwReserved[4]
Reserved.
bBuffer[1]
Pointer to the input buffer.
Remarks
The SENDCMDINPARAMS structure is used with the SMART_SEND_DRIVE_COMMAND and SMART_RCV_DRIVE_DATA I/O control code requests. These IOCTLs must be handled by drivers that support Self-Monitoring Analysis and Reporting Technology (SMART).
SMART_SEND_DRIVE_COMMAND
The SMART_SEND_DRIVE_COMMAND control code sends one of the following SMART commands to the device:
- Enable or disable reporting on the device
- Enable or disable autosaving of attributes
- Save current attributes now
- Execute offline diagnostics
- Get current SMART status
- Write to SMART log
Input Parameters
The buffer at Irp->AssociatedIrp.SystemBuffer contains a SENDCMDINPARAMS structure that describes the command being sent to the device. The irDriveRegs.bCommandReg member must specify SMART_CMD. The irDriveRegs.bFeaturesReg member must specify a SMART subcommand. For a list of subcommands, see IDEREGS.
If the caller specifies a SMART subcommand of SMART_WRITE_LOG in irDriveRegs.bFeaturesReg, caller must also indicate the number of sectors to write in irDriveRegs.bSectorCountReg. The input buffer size must be >= sizeof(SENDCMDINPARAMS) - 1) + (irDriveRegs.bSectorCountReg * SMART_LOG_SECTOR_SIZE). Caller must put the data to write in the buffer indicated by the bBuffer member of SENDCMDINPARAMS.
Parameters.DeviceIoControl.InputBufferLength specifies the size in, bytes, of the input buffer, which must be >= (sizeof(SENDCMDINPARAMS) - 1).
Parameters.DeviceIoControl.OutputBufferLength specifies the size, in bytes, of the output buffer, which must be >= (sizeof(SENDCMDOUTPARAMS) - 1). If SMART status is being requested, the output buffer must be >= (sizeof(SENDCMDOUTPARAMS) - 1 + sizeof(IDEREGS)).
Output Parameters
The driver returns the SENDCMDOUTPARAMS structure to the buffer at Irp->AssociatedIrp.SystemBuffer. If SMART status was requested and successfully received from the device, the driver includes the IDEREGS structure in the output buffer.
I/O Status Block
When the driver sets the Status field to STATUS_SUCCESS, it sets the Information field is set to ((sizeof(SENDCMDOUTPARAMS) - 1) + sizeof(IDEREGS)) for returning SMART status and to (sizeof(SENDCMDOUTPARAMS) - 1) for all other commands. The driver should set the Status field to STATUS_INVALID_PARAMETER if an input parameter is incorrect or to STATUS_IO_DEVICE_ERROR if the device aborts a command it does not support. If Status is not STATUS_SUCCESS, the driver sets the Information field to zero.
SMART_RCV_DRIVE_DATA
The SMART_RCV_DRIVE_DATA control code returns the ATA-2 identify data, the SMART thresholds, or the SMART attributes for the device.
SMART_RCV_DRIVE_DATA Input Parameters
The buffer at Irp->AssociatedIrp.SystemBuffer contains a SENDCMDINPARAMS structure that describes the request being sent to the device. The irDriveRegs.bCommandReg member specifies ID_CMD when identify data is requested and SMART_CMD when SMART data is requested. For a list of values that can be assigned to the features register (irDriveRegs.bFeaturesReg), see IDEREGS.
Parameters.DeviceIoControl.InputBufferLength specifies the size, in bytes, of the input buffer, which must be >= (sizeof(SENDCMDINPARAMS) - 1).
Parameters.DeviceIoControl.OutputBufferLength specifies the size, in bytes, of the output buffer, which must be >= (sizeof(SENDCMDOUTPARAMS) - 1 + 512).
SMART_RCV_DRIVE_DATA Output Parameters
The driver returns the SENDCMDOUTPARAMS structure and a 512-byte buffer of drive data to the buffer at Irp->AssociatedIrp.SystemBuffer.
If the caller specifies a SMART subcommand of SMART_READ_LOG in irDriveRegs.bFeaturesReg, the caller must also indicate the number of sectors to read in irDriveRegs.bSectorCountReg. The output buffer size must be >= the maximum of the following values: sizeof(SENDCMDOUTPARAMS) or sizeof(SENDCMDINPARAMS)) -1 + (irDriveRegs.bSectorCountReg** * SMART_LOG_SECTOR_SIZE)
The data read from the log will be placed in the buffer specified by the bBuffer member of SENDCMDOUTPARAMS.
SMART_RCV_DRIVE_DATA I/O Status Block
The driver sets the Information field to (sizeof(SENDCMDOUTPARAMS) - 1 + 512) when it sets the Status field to STATUS_SUCCESS. Otherwise, the driver sets the Information field to zero and the Status field to possibly STATUS_INVALID_PARAMETER or STATUS_INSUFFICIENT_RESOURCES.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 |
| Header | ntdddisk.h (include Ntdddisk.h) |