Transport code in C++
Before reading this section, you should review the information on the IPC mechanism in KasperskyOS and the IDL, CDL, and EDL descriptions.
Implementation of interprocess interaction requires transport code, which is responsible for generating, sending, receiving, and processing IPC messages.
However, a developer of a KasperskyOS-based solution does not have to write their own transport code. Instead, you can use the special tools and libraries included in the KasperskyOS SDK. These libraries enable a solution component developer to generate transport code based on IDL, CDL and EDL descriptions related to this component.
Transport code
The KasperskyOS SDK includes the nkppmeta compiler for generating transport code in C++.
The nkppmeta compiler lets you generate transport C++ proxy objects and stubs for use by both a client and a server.
Proxy objects are used by the client to pack the parameters of the called method into an IPC request, execute the IPC request, and unpack the IPC response.
Stubs are used by the server to unpack the parameters from the IPC request, dispatch the call to the appropriate method implementation, and pack the IPC response.
Generating transport code for development in C++
The CMake commands add_nk_idl(), add_nk_cdl() and add_nk_edl() are used to generate transport proxy objects and stubs using the nkppmeta compiler when building a solution.
С++ types in the *.idl.cpp.h file
Each interface is defined in an IDL description. This description defines the interface name, signatures of interface methods, and data types for the parameters of interface methods.
The CMake command add_nk_idl() is used to generate transport code when building a solution. This command creates a CMake target for generating header files for the defined IDL file when using the nkppmeta compiler.
The generated header files contain a C++ representation for the interface and data types described in the IDL file, and the methods required for use of proxy objects and stubs.
The mapping of data types declared in an IDL file to C++ types are presented in the table below.
Mapping IDL types to C++ types
IDL type | C++ type |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Working with transport code in C++
The scenarios for developing a client and server that exchange IPC messages are presented in the sections titled Statically creating IPC channels for C++ development and Dynamically creating IPC channels for C++ development.
