#include <endian.h>
+#include "macro.h"
+
+/* Packet header */
+
+struct _packed_ bus_header {
+ /* The first four fields are identical for dbus1, and dbus2 */
+ uint8_t endian;
+ uint8_t type;
+ uint8_t flags;
+ uint8_t version;
+
+ union _packed_ {
+ /* dbus1: Used for SOCK_STREAM connections */
+ struct _packed_ {
+ 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;
+ } dbus1;
+
+ /* dbus2: Used for kdbus connections */
+ struct _packed_ {
+ uint32_t _reserved;
+ uint64_t cookie;
+ } dbus2;
+
+ /* Note that both header versions have the same size! */
+ };
+};
+
/* Endianness */
enum {