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authorLennart Poettering <lennart@poettering.net>2013-12-05 03:16:15 +0100
committerLennart Poettering <lennart@poettering.net>2013-12-05 03:19:18 +0100
commitbc25a2fb66ebf14589bb7ce5ecbd35301ee484ac (patch)
treec65a6530c9578d041308d0dc3c9bd2dde0e708f0
parentea6ad56836bcbb09038eb1c0912e97dc8686b1d8 (diff)
bus: start maintaining a list of difference between kdbus/dbus1
-rw-r--r--Makefile.am4
-rw-r--r--src/libsystemd-bus/DIFFERENCES26
2 files changed, 29 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am
index 194aaa8fbf..7bedd76f39 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2027,7 +2027,9 @@ pkgconfiglib_DATA += \
src/libsystemd-bus/libsystemd-bus.pc
EXTRA_DIST += \
- src/libsystemd-bus/libsystemd-bus.pc.in
+ src/libsystemd-bus/libsystemd-bus.pc.in \
+ src/libsystemd-bus/DIFFERENCES \
+ src/libsystemd-bus/GVARIANT-SERIALIZATION
lib_LTLIBRARIES += \
libsystemd-bus.la
diff --git a/src/libsystemd-bus/DIFFERENCES b/src/libsystemd-bus/DIFFERENCES
new file mode 100644
index 0000000000..1c2bf99dd4
--- /dev/null
+++ b/src/libsystemd-bus/DIFFERENCES
@@ -0,0 +1,26 @@
+Known differences between dbus1 and kdbus:
+
+- NameAcquired/NameLost is gone entirely on kdbus backends if
+ libsystemd-bus is used. It is still added in by systemd-bus-proxyd
+ for old dbus1 clients, and it is available if libsystemd-bus is used
+ against the classic dbus1 daemon. If you want to write compatible
+ code with libsystem-bus you need to explicitly subscribe to
+ NameOwnerChanged signals and just ignore NameAcquired/NameLost
+
+- Applications have to deal with spurious signals they didn't expect,
+ due to the probabilistic bloom filters. They need to handle this
+ anyway, given that any client can send anything to arbitrary clients
+ anyway, even in dbus1, so not much changes.
+
+- clients of the system bus when kdbus is used must roll their own
+ security. Only legacy dbus1 clients get the old XML policy enforced,
+ which is implemented by systemd-bus-proxyd.
+
+- Serial numbers of synthesized messages are always (uint32_t) -1.
+
+- The org.freedesktop.DBus "driver" service is not special on
+ kdbus. It is a bus activated service like any other with its own
+ unique name.
+
+- NameOwnerChanged is a synthetic message, generated locally and not
+ by the driver.