#include <endian.h>
+/* Packet header */
+
+struct bus_header {
+ uint8_t endian;
+ uint8_t type;
+ uint8_t flags;
+ uint8_t version;
+ uint32_t body_size;
+
+ /* Note that what the bus spec calls "serial" we'll call
+ "cookie" instead, because we don't want to imply that the
+ cookie was in any way monotonically increasing. */
+ uint32_t serial;
+ uint32_t fields_size;
+} _packed_;
+
/* Endianness */
enum {