Channel operations

At this point in the driver code, we've defined all the necessary elements needed by the various channel operations that will do the work of the driver and interface otherwise with the UDI environment. Now we define the channel operations.

Both the udi_cmos and pseudod sample drivers define three groups of channel operations:

• parent operations for the channel between the driver and the bus bridge; these operations are entry points into the driver code for the bus bridge, and their associated driver routines (see ``udi_cmos parent channel operations'' and ``pseudod parent channel operations'')

• child operations for the channel between the driver and the GIO external mapper; these operations (and their associated routines) are executed by the driver in response to UDI service calls from the mapper (which is a GIO client for this channel) (see ``udi_cmos child channel operations'' and ``pseudod child channel operations'')

• management channel operations for the UDI Management Agent (this channel is present in all UDI drivers) (see ``udi_cmos Management Agent channel operations'' and ``pseudod Management Agent channel operations'')

The remainder of the code for both the udi_cmos and pseudod sample drivers defines the operations for these channels.

See Function Call Classifications and Calling Sequence and Naming Conventions in the UDI Core Specification for a review of driver function types, channel operations, and callback function conventions.