CLANGER: an interpreted systems programming language

CLANGER is a powerful, yet simple, command language for the Nemesis operating system. It uses runtime type information to interface directly with operating system components. CLANGER is a combination of command-line interpreter, scripting language, debugger and prototyping tool. This paper describes why such a language is possible, how it is being implemented, and outlines the language as it currently stands. This paper has been submitted to ACM Operating Systems Review. 1 Background Nemesis is the operating system being developed as part of the Pegasus ESPRIT Project [LMM93]. It is based on a Quality of Service (QOS) paradigm for resource management which locates as much operating system functionality as possible in the application, thereby reducing QOS crosstalk between application domains. This is achieved using a structure and linkage mechanism based on the notion of interfaces, described in [Ros94]. An interface is the point at which a service is offered. It is implemented as a..