grpc_arg_stack_push_arg - Pushes an argument onto the stack.
  int grpc_arg_stack_push_arg(grpc_arg_stack_t *stack, void *arg)
  grpc_arg_stack_t *stack  void *argThe grpc_arg_stack_push_arg() function pushes the specified argument onto the stack.
This function is MT-safe.
If successful, 0 is returned. In the case of an error, -1 is returned.
  GRPC_NOT_INITIALIZED  GRPC_OTHER_ERROR_CODE