Names are a message bus feature, so it does not make sense to connect
to NameOwnerChanged when the underlying connection is not a message
bus.
Moreover, g_dbus_connection_signal_subscribe() will also enforce that
condition. Adding this extra check here is helpful to avoid a critical
warning when using GDBusProxy with peer-to-peer connections.
https://gitlab.gnome.org/GNOME/glib/issues/1620
Currently, GDBusProxy:g-name-owner only notifies changes to the unique
name owner of the remote object in case the proxy was constructed for a
well-known name.
That sounds like an artificial restriction, and it's convenient to
connect to notify::g-name-owner if a proxy instance has already been
created for an unique name, instead of additionally using
g_bus_watch_name() to track the owner.
To fix this, always connect to NameOwnerChanged after the proxy is
initialized, instead of only doing so when the proxy was constructed for
a well-known name.
https://bugzilla.gnome.org/show_bug.cgi?id=791316https://gitlab.gnome.org/GNOME/glib/issues/1310
Make it a bit more obvious that the changed properties are provided as
an a{sv}.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Reviewed-by: nobody
If we have an input parameter (or return value) we need to use (nullable).
However, if it is an (inout) or (out) parameter, (optional) is sufficient.
It looks like (nullable) could be used for everything according to the
Annotation documentation, but (optional) is more specific.
proxy->priv->name_owner gets overwritten in async_init_data_set_name_owner() on the
assumption that it will always be NULL when we get there. However,
on_name_owner_changed() can run first, and it does set name_owner.
==20126== 42 bytes in 6 blocks are definitely lost in loss record 15,174 of 48,256
==20126== at 0x4C280F3: malloc (vg_replace_malloc.c:299)
==20126== by 0x7541D00: g_malloc (gmem.c:104)
==20126== by 0x7558FEE: g_strdup (gstrfuncs.c:364)
==20126== by 0x6DF8E4F: on_name_owner_changed (gdbusproxy.c:1399)
==20126== by 0x6DE94C4: emit_signal_instance_in_idle_cb (gdbusconnection.c:3743)
==20126== by 0x753C315: g_main_dispatch (gmain.c:3066)
==20126== by 0x753C315: g_main_context_dispatch (gmain.c:3642)
==20126== by 0x753C667: g_main_context_iterate.isra.24 (gmain.c:3713)
==20126== by 0x753CA69: g_main_loop_run (gmain.c:3907)
==20126== by 0x5E38000: meta_run (main.c:556)
==20126== by 0x401EC0: main (main.c:441)
https://bugzilla.gnome.org/show_bug.cgi?id=755439
Commit f10b655 removed the inclusion of gasyncresult.h from gdbusproxy.c,
but gdbusproxy.c uses g_async_result_get_source_object(), which caused a
build warning/error. Fix that.
Sometimes the application doesn't want to autostart a service
when it creates a proxy, but wants the service autostarted when
it makes the first method call. Allow that behavior with a new
flag.
https://bugzilla.gnome.org/show_bug.cgi?id=708828
As it turns out, we have examples of internal functions called
type_name_get_private() in the wild (especially among older libraries),
so we need to use a name for the per-instance private data getter
function that hopefully won't conflict with anything.
Back in the far-off twentieth century, it was normal on unix
workstations for U+0060 GRAVE ACCENT to be drawn as "‛" and for U+0027
APOSTROPHE to be drawn as "’". This led to the convention of using
them as poor-man's ‛smart quotes’ in ASCII-only text.
However, "'" is now universally drawn as a vertical line, and "`" at a
45-degree angle, making them an `odd couple' when used together.
Unfortunately, there are lots of very old strings in glib, and also
lots of new strings in which people have kept up the old tradition,
perhaps entirely unaware that it used to not look stupid.
Fix this by just using 'dumb quotes' everywhere.
https://bugzilla.gnome.org/show_bug.cgi?id=700746
GDBusProxy sets an error on a GSimpleAsyncResult and then returns
without dispatching the result for completion (and leaks the result in
the process). Fix that.
Also add a testcase. Unfortunately, adding the testcase uncovered
bug #672248. We can work around that by reordering the tests.
https://bugzilla.gnome.org/show_bug.cgi?id=672249
Call g_simple_async_result_set_check_cancellable() after all
GSimpleAsyncResult creation in order to take advantage of the new
reliable cancellation feature.
The guarantee of reliable cancellation fixes a bug in dbusmenu (which
was already assuming that cancellation was reliable). See this bug:
https://bugs.launchpad.net/ubuntu/+source/libdbusmenu/+bug/953562https://bugzilla.gnome.org/show_bug.cgi?id=672013
Signed-off-by: David Zeuthen <davidz@redhat.com>
This is useful when using certain D-Bus services where the
PropertiesChanged signal does not include the property value such as
e.g. various systemd mechanisms, see e.g.
https://bugs.freedesktop.org/show_bug.cgi?id=37632
Signed-off-by: David Zeuthen <davidz@redhat.com>
This is needed for thread-safety ... yes, it would have been better to
make get_object() return a full reference and have something like a
peek_object() method return a borrowed reference for C convenience
(only a single vfunc would have been needed). But such an ABI break is
too late now...
Signed-off-by: David Zeuthen <davidz@redhat.com>
Since it is valid for a D-Bus interface / service to add new methods,
signals or properties we must NEVER warn about unknown properties or
drop unknown signals or disallow unknown method invocations when we
have an expected interface.
So this means that the expected_interface machinery is only useful for
checking that the service didn't break ABI.
Also update the docs so it is clear exactly what it means to have an
expected interface.
https://bugzilla.gnome.org/show_bug.cgi?id=660886
Signed-off-by: David Zeuthen <davidz@redhat.com>
This changes the meaning of "properties_lock" from "lock for D-Bus
properties" to "lock for GObject properties".
The most common problem, and the only one I've reproduced in a regression
test, is name_owner, which can be updated by the thread that owns
the GDBusProxy's main context (i.e. the thread-default main context of
the thread that constructed it) at the same time that a blocking call
is made. When a GDBusProxy is constructed in a thread-pool thread for
short-term use, the main context will typically be the global default
main context (which is actively running in the main thread!), making
this extremely problematic.
The interface info is perhaps a theoretical concern - one thread could
conceivably set it at the same time that another thread uses it, but only
in relatively pathological situations. The current API for this does have
the problem that it returns a borrowed ref, but interface info is
hopefully permanent anyway.
The default timeout is probably only a theoretical concern - it's just an
int, so writes are indivisible, and there's no worry about whether
something has been freed - but to be safe, let's hold the lock for that
too.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=656039
Bug-NB: NB#259760
Signed-off-by: David Zeuthen <davidz@redhat.com>
This removes the need for async_init_get_name_owner_cb to cope with being
called without a real GAsyncResult, and will simplify the addition of
correct thread-locking.
In async_init_data_set_name_owner, use the name_owner parameter instead
of the corresponding member of GDBusProxyPrivate, partly to reduce
pointer-chasing but mainly to avoid needing to hold the lock.
Signed-off-by: David Zeuthen <davidz@redhat.com>
These ought to have thread-locking, and having it in the accessor seems
better than duplicating it here.
Signed-off-by: David Zeuthen <davidz@redhat.com>
If you run:
( cd gio/tests && G_DBUS_DEBUG=all ./gdbus-proxy-well-known-name )
you can see that in the case where the name com.example.TestService isn't
owned yet, the GDBusProxy calls GetAll() with no destination, resulting
in an error reply from the peer (the dbus-daemon itself). That's clearly
not right!
However, if priv->name is NULL, that indicates the special case where we
really do want to talk directly to a peer, instead of via the bus daemon
(most likely to be used on peer-to-peer connections); in that special
case, do call GetAll().
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: David Zeuthen <davidz@redhat.com>
This avoids calling g_variant_unref and g_free on uninitialized memory
if PropertiesChanged is received in the creating thread's thread-default
main context's thread, at the same time as releasing the last ref in
another thread. This would result in "goto out" before the variables
freed after that label had been initialized to NULL.
Based on a patch by Simon McVittie, bug 656282
Also add convenience _with_unix_fd_list variants to GDBusConnection,
GDBusProxy and GDBusMethodInvocation types to easily support this.
Signed-off-by: David Zeuthen <davidz@redhat.com>
