*entry and *key are valid until next call to rados_objects_list_*
@param ctx iterator marking where you are in the listing
@param entry where to store the name of the entry
@param key where to store the object locator (set to NULL to ignore)
@param nspace where to store the object namespace (set to NULL to ignore)
@returns 0 on success, negative error code on failure
@returns -ENOENT when there are no more objects to list
Get the next object name and locator in the pool
*entry and *key are valid until next call to rados_objects_list_*
@param ctx iterator marking where you are in the listing @param entry where to store the name of the entry @param key where to store the object locator (set to NULL to ignore) @param nspace where to store the object namespace (set to NULL to ignore) @returns 0 on success, negative error code on failure @returns -ENOENT when there are no more objects to list