bus: actually unmap kdbus pool after use

[elogind.git] / src / libsystemd-bus / bus-kernel.h

diff --git a/src/libsystemd-bus/bus-kernel.h b/src/libsystemd-bus/bus-kernel.h
index ac746afe0373970fe7fd4f9f823ba6d4ad1c97c6..8cf153ab4111d0bc7556a2dd37734cba14431c22 100644 (file)
--- a/src/libsystemd-bus/bus-kernel.h
+++ b/src/libsystemd-bus/bus-kernel.h
@@ -23,6 +23,26 @@
 
 #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 (32*1024)
+
+/* This determines at which minimum size we prefer sending memfds over
+ * sending vectors */
+#define MEMFD_MIN_SIZE (32*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 +50,8 @@ 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);