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-rw-r--r--src/libsystemd/sd-bus/bus-kernel.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.h b/src/libsystemd/sd-bus/bus-kernel.h
new file mode 100644
index 0000000..fbbc43f
--- /dev/null
+++ b/src/libsystemd/sd-bus/bus-kernel.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "sd-bus.h"
+
+#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 (512*1024)
+
+struct memfd_cache {
+ int fd;
+ void *address;
+ size_t mapped;
+ size_t allocated;
+};
+
+void close_and_munmap(int fd, void *address, size_t size);
+void bus_flush_memfd(sd_bus *bus);