Windows Driver Kit: Buses
IRB
Drivers use this structure to pass most requests to IEEE 1394 bus driver.
typedef struct _IRB {
ULONG FunctionNumber;
ULONG Flags;
ULONG BusReserved[IRB_BUS_RESERVED_SZ];
ULONG PortReserved[IRB_PORT_RESERVED_SZ];
union {
.
.
.
} u;
}
Members
- FunctionNumber
- Determines the type of request. Each request type is documented under the value of FunctionNumber in IEEE 1394 Bus I/O Requests.
- Flags
- Reserved. Drivers must set this member to zero with one exception. When making a REQUEST_ISOCH_ALLOCATE_BANDWIDTH request, the caller can set the IRB_FLAG_ALLOW_REMOTE_FREE flag in Flags to indicate that the system should free the bandwidth handle memory pointed to be IsochAllocateBandwidth.hBandwidth. If caller does not set this flag, then caller will have to free the bandwidth handle.
- BusReserved
- Reserved.
- PortReserved
- Reserved.
- u
- Specifies a union of structures, one for each value of FunctionNumber. The applicable submembers of u for each request are described with each request type in IEEE 1394 Bus I/O Requests.
Comments
The Parameters->Others.Arguments1 member of an IOCTL_1394_CLASS IRP points to an IRB structure. The bus driver uses the IRB to determine the type of request made by the device driver, and also to return the results of the operation. See IEEE 1394 Bus I/O Requests for a description of the behavior of each request.
Requirements
Headers: Declared in 1394.h. Include 1394.h.
See Also
IOCTL_1394_CLASS