1 files changed, 38 insertions, 0 deletions
diff --git a/src/libsystemd-bus/bus-kernel.h b/src/libsystemd-bus/bus-kernel.h
index ac746afe03..c4573c9222 100644
--- a/src/libsystemd-bus/bus-kernel.h
+++ b/src/libsystemd-bus/bus-kernel.h
@@ -23,6 +23,37 @@
 
 #include "sd-bus.h"
 
+#define KDBUS_ITEM_NEXT(item) \
+        (typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
+
+#define KDBUS_ITEM_FOREACH(item, head)                                          \
+        for (item = (head)->items;                                              \
+             (uint8_t *)(item) < (uint8_t *)(head) + (head)->size;              \
+             item = KDBUS_ITEM_NEXT(item))
+
+#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
+#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
+
+#define MEMFD_CACHE_MAX 32
+
+/* When we cache a memfd block for reuse, we will truncate blocks
+ * longer than this in order not to keep too much data around. */
+#define MEMFD_CACHE_ITEM_SIZE_MAX (128*1024)
+
+/* This determines at which minimum size we prefer sending memfds over
+ * sending vectors */
+#define MEMFD_MIN_SIZE (128*1024)
+
+/* The size of the per-connection memory pool that we set up and where
+ * the kernel places our incoming messages */
+#define KDBUS_POOL_SIZE (16*1024*1024)
+
+struct memfd_cache {
+        int fd;
+        void *address;
+        size_t size;
+};
+
 int bus_kernel_connect(sd_bus *b);
 int bus_kernel_take_fd(sd_bus *b);
 
@@ -30,3 +61,10 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m);
 int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m);
 
 int bus_kernel_create(const char *name, char **s);
+
+int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size);
+void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size);
+
+void bus_kernel_flush_memfd(sd_bus *bus);
+
+int bus_kernel_parse_unique_name(const char *s, uint64_t *id);