bus: keep kernel bus fd around during entire life-time of bus

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

diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index 9cc1c9c8996f068b97921e80520a80e1709b85e1..5ba32ad8fd7c6e40e7c859cd0b8854caee1a50d6 100644 (file)
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -29,10 +29,12 @@
 #include "prioq.h"
 #include "list.h"
 #include "util.h"
+#include "refcnt.h"
 
 #include "sd-bus.h"
 #include "bus-error.h"
 #include "bus-match.h"
+#include "bus-kernel.h"
 
 struct reply_callback {
         sd_bus_message_handler_t callback;
@@ -46,6 +48,8 @@ struct filter_callback {
         sd_bus_message_handler_t callback;
         void *userdata;
 
+        unsigned last_iteration;
+
         LIST_FIELDS(struct filter_callback, callbacks);
 };
 
@@ -55,6 +59,8 @@ struct object_callback {
 
         char *path;
         bool is_fallback;
+
+        unsigned last_iteration;
 };
 
 enum bus_state {
@@ -62,9 +68,14 @@ enum bus_state {
         BUS_OPENING,
         BUS_AUTHENTICATING,
         BUS_HELLO,
-        BUS_RUNNING
+        BUS_RUNNING,
+        BUS_CLOSED
 };
 
+static inline bool BUS_IS_OPEN(enum bus_state state) {
+        return state > BUS_UNSET && state < BUS_CLOSED;
+}
+
 enum bus_auth {
         _BUS_AUTH_INVALID,
         BUS_AUTH_EXTERNAL,
@@ -72,11 +83,21 @@ enum bus_auth {
 };
 
 struct sd_bus {
-        unsigned n_ref;
+        /* We use atomic ref counting here since sd_bus_message
+           objects retain references to their originating sd_bus but
+           we want to allow them to be processed in a different
+           thread. We won't provide full thread safety, but only the
+           bare minimum that makes it possible to use sd_bus and
+           sd_bus_message objects independently and on different
+           threads as long as each object is used only once at the
+           same time. */
+        RefCount n_ref;
+
         enum bus_state state;
         int input_fd, output_fd;
         int message_version;
 
+        bool is_kernel:1;
         bool negotiate_fds:1;
         bool can_fds:1;
         bool bus_client:1;
@@ -86,6 +107,9 @@ struct sd_bus {
         bool prefer_readv:1;
         bool prefer_writev:1;
         bool processing:1;
+        bool match_callbacks_modified:1;
+        bool filter_callbacks_modified:1;
+        bool object_callbacks_modified:1;
 
         void *rbuffer;
         size_t rbuffer_size;
@@ -115,6 +139,8 @@ struct sd_bus {
         } sockaddr;
         socklen_t sockaddr_size;
 
+        char *kernel;
+
         sd_id128_t server_id;
 
         char *address;
@@ -139,6 +165,12 @@ struct sd_bus {
         char **exec_argv;
 
         uint64_t hello_serial;
+        unsigned iteration_counter;
+
+        void *kdbus_buffer;
+
+        struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
+        unsigned n_memfd_cache;
 };
 
 static inline void bus_unrefp(sd_bus **b) {
@@ -178,6 +210,7 @@ bool namespace_simple_pattern(const char *pattern, const char *value);
 bool path_simple_pattern(const char *pattern, const char *value);
 
 int bus_message_type_from_string(const char *s, uint8_t *u);
+const char *bus_message_type_to_string(uint8_t u);
 
 #define error_name_is_valid interface_name_is_valid