Archipelago » qemu

static void qdev_get_link_property(DeviceState *dev, Visitor *v, void *opaque,

                                   const char *name, Error **errp)

{

    DeviceState **child = opaque;

    gchar *path;

    if (*child) {

        path = qdev_get_canonical_path(*child);

        visit_type_str(v, &path, name, errp);

        g_free(path);

    } else {

        path = (gchar *)"";

        visit_type_str(v, &path, name, errp);

    }

}

static void qdev_set_link_property(DeviceState *dev, Visitor *v, void *opaque,

                                   const char *name, Error **errp)

{

    DeviceState **child = opaque;

    bool ambiguous = false;

    const char *type;

    char *path;

    type = qdev_property_get_type(dev, name, NULL);

    visit_type_str(v, &path, name, errp);

    if (*child) {

        qdev_unref(*child);

    }

    if (strcmp(path, "") != 0) {

        DeviceState *target;

        target = qdev_resolve_path(path, &ambiguous);

        if (target) {

            gchar *target_type;

            target_type = g_strdup_printf("link<%s>", target->info->name);

            if (strcmp(target_type, type) == 0) {

                *child = target;

                qdev_ref(target);

            } else {

                error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, type);

            }

            g_free(target_type);

        } else {

            error_set(errp, QERR_DEVICE_NOT_FOUND, path);

        }

    } else {

        *child = NULL;

    }

    g_free(path);

}

void qdev_property_add_link(DeviceState *dev, const char *name,

                            const char *type, DeviceState **child,

                            Error **errp)

{

    gchar *full_type;

    full_type = g_strdup_printf("link<%s>", type);

    qdev_property_add(dev, name, full_type,

                      qdev_get_link_property,

                      qdev_set_link_property,

                      NULL, child, errp);

    g_free(full_type);

}

/**

 * @qdev_property_add_link - Add a link property to a device

 *

 * Links establish relationships between devices.  Links are unidirectional

 * although two links can be combined to form a bidirectional relationship

 * between devices.

 *

 * Links form the graph in the device model.

 *

 * @dev - the device to add a property to

 *

 * @name - the name of the property

 *

 * @type - the qdev type of the link

 *

 * @child - a pointer to where the link device reference is stored

 *

 * @errp - if an error occurs, a pointer to an area to store the area

 */

void qdev_property_add_link(DeviceState *dev, const char *name,

                            const char *type, DeviceState **child,

                            Error **errp);