Building Filter IDL from Server IDL

Filter IDL can be obtained from the server IDL in two ways:

• By manually writing the code for the IDL complying a set of predefined relationship rules mentioned below.
• By using the fidlgen utility.

Relationship between server and filter interfaces:

• For every method in the server interface, there exists at least one up-filter method in the filter interface.
• For each up-filter method in the filter interface, all the arguments corresponding to those in the server method are inout.
• For every method in the server interface returning non-void value, there exists at least one down-filter method.

The fidlgen utility can be used to directly generate the filter IDLs.