C

 rv = c->fun();//执行命令
  if (rv == HPI_SHELL_PARM_ERROR)
  {
   printf("Invalid parameters:\n%s\n", cmd_line);
   printf("%s\n", c->help);
   go_to_dialog();
   shell_error = HPI_SHELL_PARM_ERROR;
   return(3);
  }
  else if (rv == HPI_SHELL_CMD_ERROR)
  {
   printf("Command failed:\n%s\n", cmd_line);
   go_to_dialog();
   return(3);
  };
  
  shell_error = rv;