int mdb_add_walker(const mdb_walker_t *w);
Register a new walker with the debugger. The walker is added to the module's namespace, and to the debugger's global namespace according to the name resolution rules described in "dcmd and Walker Name Resolution". This function returns 0 for success, or -1 for error if the given walker name is already registered by this module, or if the walker structure w is improperly constructed. The information in the mdb_walker_t w is copied to internal debugger structures, so the caller can reuse or free this structure after the call to mdb_add_walker().