text: /*
   * QEMU Random Number Generator Backend
   *
   * Copyright IBM, Corp. 2012
   *
   * Authors:
   *  Anthony Liguori   <aliguori@us.ibm.com>
   *
   * This work is licensed under the terms of the GNU GPL, version 2 or later.
   * See the COPYING file in the top-level directory.
   */
  
  #include "sysemu/rng.h"
  #include "qapi/qmp/qerror.h"
  #include "qom/object_interfaces.h"
  
  void rng_backend_request_entropy(RngBackend *s, size_t size,
                                   EntropyReceiveFunc *receive_entropy,
                                   void *opaque)
  {
      RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
  
      if (k->request_entropy) {
          k->request_entropy(s, size, receive_entropy, opaque);
      }
  }
  
  void rng_backend_cancel_requests(RngBackend *s)
  {
      RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
  
      if (k->cancel_requests) {
          k->cancel_requests(s);
      }
  }
  
  static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
  {
      RngBackend *s = RNG_BACKEND(obj);
  
      return s->opened;
  }
  
  static void rng_backend_complete(UserCreatable *uc, Error **errp)
  {
      object_property_set_bool(OBJECT(uc), true, "opened", errp);
  }
  
  static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
  {
      RngBackend *s = RNG_BACKEND(obj);
      RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
      Error *local_err = NULL;
  
      if (value == s->opened) {
          return;
      }
  
      if (!value && s->opened) {
          error_set(errp, QERR_PERMISSION_DENIED);
          return;
      }
  
      if (k->opened) {
          k->opened(s, &local_err);
          if (local_err) {
              error_propagate(errp, local_err);
              return;
          }
      }
  
      s->opened = true;
  }
  
  static void rng_backend_init(Object *obj)
  {
      object_property_add_bool(obj, "opened",
                               rng_backend_prop_get_opened,
                               rng_backend_prop_set_opened,
                               NULL);
  }
  
  static void rng_backend_class_init(ObjectClass *oc, void *data)
  {
      UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
  
      ucc->complete = rng_backend_complete;
  }
  
  static const TypeInfo rng_backend_info = {
      .name = TYPE_RNG_BACKEND,
      .parent = TYPE_OBJECT,
      .instance_size = sizeof(RngBackend),
      .instance_init = rng_backend_init,
      .class_size = sizeof(RngBackendClass),
      .class_init = rng_backend_class_init,
      .abstract = true,
      .interfaces = (InterfaceInfo[]) {
          { TYPE_USER_CREATABLE },
          { }
      }
  };
  
  static void register_types(void)
  {
      type_register_static(&rng_backend_info);
  }
  
  type_init(register_types);
  