Instead of building a reversed linked list by prepending in order and
then reversing it at the end, prepend in reverse by iterating backwards
through the directories (to get a list in-order when we're done).
These functions no longer have anything to do with GSettings itself, so
they should not be in that file anymore.
GSettings still wants direct access to the GSettingsSchemaKey structure,
so put that one in gsettingsschema-internal.h.
We now avoid the per-enumerated-file stat for type and names. We could
improve this further by moving things to the no_stat function, but this
is what the file chooser needs for autocomplete, so I am happy.
We now sort the matchers and remove unnecessary duplicates (like
removing standard:type when we already match standard:*), so that we can
do more complex operations on them easily in later commits.
Include the hostname (or proxy hostname if it was the connection to
the proxy server that failed) in the GError message when
g_socket_client_connect* fail.
https://bugzilla.gnome.org/show_bug.cgi?id=661266
Previously, if you created a GUnixInputStream or GUnixOutputStream
from a non-blocking file descriptor, it might sometimes return
G_IO_ERROR_WOULD_BLOCK from g_input_stream_read/g_output_stream_write,
which is wrong. Fix that. (Use the GPollableInput/OutputStream methods
if you want non-blocking I/O.)
Also, add a test for this to gio/tests/unix-streams.
Also, fix the GError messages to say "Error reading from file
descriptor", etc instead of "Error reading from unix" (which was
presumably from a bad search and replace job).
https://bugzilla.gnome.org/show_bug.cgi?id=626866
Add GNetworkMonitor and its associated extension point, provide a base
implementation that always claims the network is available, and a
netlink-based implementation built on top of that that actually tracks
the network state.
https://bugzilla.gnome.org/show_bug.cgi?id=620932
If the fd is not a pipe or socket, fall back to using threads to do
async I/O rather than poll, since poll doesn't work the way you want
for ordinary files.
https://bugzilla.gnome.org/show_bug.cgi?id=606913
My previous fix for GNOME#662100 was incomplete: it seems that with some
timings, the stream can be closed with an async read in-flight. This
can make the read fail immediately with G_IO_ERROR_CLOSED instead of
becoming cancelled.
This happens reliably on an embedded device, and rarely on my laptop;
repeating the test 100 times in quick succession reliably reproduces
the bug on my laptop.
It seems as though what we really want is to ignore read errors, once
we've established that we want to close the connection anyway - this
means that after asking to close, you're immune to exit-on-close,
which seems like a good rule.
An additional subtlety is that continuing to read after we know we
want to close is still required, otherwise we'll never emit ::closed.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=662100
Bug-NB: NB#287088
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Colin Walters <walters@verbum.org>
If the GDBusObjectManagerClient doesn't get a name owner during its lifetime,
`on_control_proxy_g_signal' will never be connected to any signal, so we
shouldn't dump any warning in that case.
Fixes https://bugzilla.gnome.org/show_bug.cgi?id=662858
Strictly speaking, neither of the two uses that aren't under the lock
*needs* to be atomic, but it seems better to be obviously correct (and
we save another 4 bytes of struct).
One of these uses is in g_dbus_connection_is_closed(), any use of which
is inherently a race condition anyway.
The other is g_dbus_connection_flush_sync, which as far as I can tell
just needs a best-effort check, to not waste effort on a connection that
has been closed for a while (but I could be wrong).
I removed the check for the closed flag altogether in
g_dbus_connection_send_message_with_reply_unlocked, because it turns out
to be redundant with one in g_dbus_connection_send_message_unlocked,
which is called immediately after.
g_dbus_connection_close_sync held the lock to check the closed flag,
which is no longer needed.
As far as I can tell, the only reason why the lock is still desirable
when setting the closed flag is so that remove_match_rule can't fail
by racing with close notification from the worker thread - but
on_worker_closed needs to hold the lock anyway, to deal with other
data structures, so there's no point in trying to eliminate the
requirement to hold the lock.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
Also, a few that don't need to be.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
This isn't strictly necessary, because in every location where it's
checked, if the reading thread misses an update from another thread,
it's indistinguishable from the reading thread having been scheduled
before the writing thread, which is an unavoidable race condition that
callers need to cope with anyway. On the other hand, merging exit_on_close
into atomic_flags gives the least astonishing semantics to library users
and saves 4 bytes of struct, and if you're accessing exit-on-close often
enough for it to be a performance concern, you're probably doing it wrong.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
The thread shared between all GDBusWorker instances was variously called
the "worker thread" or "message handler thread", which I mostly changed to
"the GDBusWorker thread" to avoid ambiguity.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
As part of the deserialisation process of a zero-length array in the
DBus wire format, parse_value_from_blob() recursively calls itself with
the expectation of failing (as can be seen by the assert immediately
following).
It passes &local_error to this always-failing call and then fails to
free it (indeed, to use it at all). The result is that the GError is
leaked.
Fix it by passing in NULL instead, so that the GError is never created
in the first place.
https://bugzilla.gnome.org/show_bug.cgi?id=662411
The only exceptions are those of the trivial getters/setters that don't
already need the initialization check for its secondary role as a memory
barrier (this is consistent with GSocket, where trivial getters/setters
don't check):
* g_dbus_connection_set_exit_on_close
* g_dbus_connection_get_exit_on_close
* g_dbus_connection_is_closed
g_dbus_connection_set_exit_on_close needs to be safe for
use before initialization anyway, so it can be set at construct-time.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661689
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
Also document which fields require such a check in order to have correct
threading semantics.
This usage doesn't matches the GInitable documentation, which suggests
use of a GError - but using an uninitialized GDBusConnection is
programming error, and not usefully recoverable. (The GInitable
documentation may have been a mistake - GNOME#662208.) Also, not all of
the places where we need it can raise a GError.
The check serves a dual purpose: it turns a non-deterministic crash into
a deterministic critical warning, and is also a memory barrier for
thread-safety. All of these functions dereference or return fields that
are meant to be protected by FLAG_INITIALIZED, so they could crash or
return an undefined value to their caller without this, if called from a
thread that isn't the one that called initable_init() (although I can't
think of any way to do that without encountering a memory barrier,
undefined behaviour, or a race condition that leads to undefined
behaviour if the non-initializing thread wins the race).
One exception is that initable_init() itself makes a synchronous call.
We deal with that by passing new internal flags up the call stack, to
reassure g_dbus_connection_send_message_unlocked() that it can go ahead.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661689
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
The comment implied that even failed initialization would set
is_initialized = TRUE, but this wasn't the case - failed initialization
would only set initialization_error, and it was necessary to check both.
It turns out the documented semantics are nicer than the implemented
semantics, since this lets us use atomic operations, which are also
memory barriers, to avoid needing separate memory barriers or locks
for initialization_error (and other members that are read-only after
construction).
I expect to need more than one atomically-accessed flag to fix thread
safety, so instead of a minimal implementation I've turned is_initialized
into a flags word.
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661689
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661992
Reviewed-by: David Zeuthen <davidz@redhat.com>
We didn't previously test anything except the implicit default of TRUE.
Now we test implicit TRUE, explicit TRUE, explicit FALSE, and
disconnecting at the local end (which regressed while fixing Bug #651268).
Also avoid some questionable use of a main context, which fell foul of
Bug #658999 and caused this test to be disabled in master.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=662100
Bug-NB: NB#287088
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
This was a regression caused by my previous work on GDBusWorker thread-safety
(Bug #651268). The symptom is that if you disconnect a GDBusConnection
locally, the default implementation of GDBusConnection::closed
terminates your process, even though it shouldn't do that for
locally-closed connections; this is because GDBusWorker didn't think a
cancelled read was a local close.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=662100
Bug-NB: NB#287088
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: David Zeuthen <davidz@redhat.com>
GDBusConnection sets the closed flag in the worker thread, then adds an
idle callback (which refs the Connection) to signal this in the main
thread. The tests session_bus_down doesn't spin the mainloop, so the
"closed" signal will always fire if iterating the mainloop later (and
drops the ref when doing so). But _is_closed can return TRUE even before
signalling this, in which case the "closed" signal isn't fired and the
ref isn't dropped, causing the test to fail.
Instead simply always wait for the closed signal, which is a good thing
to check anyway and ensures the ref is closed.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=661896
Reviewed-by: Matthias Clasen <mclasen@redhat.com>
This was used as an optimisation for the macro hackery that used to live
in gthread.h. If a particular library or program knew that it could
rely on thread support being enabled, it would allow for static
evaluation of conditionals in some of those macros.
Since the macros are dead and thread support is now always-on, we can
get rid of this bit of legacy.
Add functions for manipulating the environment under which a
GAppLaunchContext will launch its children, to avoid thread-related
bugs with using setenv() directly.
FIXME: win32 side isn't implemented yet
https://bugzilla.gnome.org/show_bug.cgi?id=659326
With search gaining traction as being the preferred way to locate
applications, the existing .desktop file fields meant for browsing
often produce insufficient results.
gnome-control-center introduced a custom X-GNOME-Keywords field for
that purpose, which we plan to support in gnome-shell as well.
https://bugzilla.gnome.org/show_bug.cgi?id=661763
And remove the 'joinable' argument from g_thread_new() and
g_thread_new_full().
Change the wording in the docs. Clarify expectations for
(deprecated) g_thread_create().
It is possible for _g_io_module_get_default() to be called recursively
(eg, if a module of one type is loaded that tries to look up gsettings
from its init() method and ends up causing the gsettings module to be
loaded). So use a recursive mutex.
If the connection to the bus is lost while a method call is ongoing,
the method call does not get cancelled. Instead it just sits around
until it times out.
This is visible here on XO laptops when stopping the display manager
during shutdown. imsettings starts sending a sync message to give up
its bus name (via g_bus_unown_name()), then systemd terminates the
session bus at approximately the same time. imsettings then hangs for
about 20 seconds before timing out the message.
http://lists.freedesktop.org/archives/dbus/2011-September/014717.html
imsettings behaviour could be improved as described in that thread,
but I think this is a glib bug. I've also come up with the attached
patch which fixes it.
Credits for the bug-fix goes to Daniel Drake <dsd@laptop.org>. The test
case was written by David Zeuthen <zeuthen@gmail.com>.
https://bugzilla.gnome.org/show_bug.cgi?id=660637
Signed-off-by: David Zeuthen <davidz@redhat.com>
Add g_main_context_ref_thread_default(), which always returns a
reffed GMainContext, rather than sometimes returning a (non-reffed)
GMainContext, and sometimes returning NULL. This simplifies the
bookkeeping in any code that needs to keep a reference to the
thread-default context for a while.
https://bugzilla.gnome.org/show_bug.cgi?id=660994
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>
These were the last users of the dynamic allocation API.
Keep the uses in glib/tests/mutex.c since this is actually meant to test
the API (which has to continue working, even if it is deprecated).
https://bugzilla.gnome.org/show_bug.cgi?id=660739
Add _g_io_module_get_default(), which implements the
figure-out-the-best-available-module-that-is-actually-usable logic,
and use that to simplify g_proxy_resolver_get_default(),
g_settings_backend_get_default(), g_tls_backend_get_default(), and
g_vfs_get_default().
https://bugzilla.gnome.org/show_bug.cgi?id=620932
g_file_make_directory_with_parents() will fail for already
existing directories, unlike g_mkdir_with_parents(), so mention
this clearly in the docs.
https://bugzilla.gnome.org/show_bug.cgi?id=660791
The GIOScheduler was using a GCond in a way that didn't deal with the
possibility of spurious wakeups. Add an explicit predicate and a loop.
Problem caught by Matthias Clasen.
https://bugzilla.gnome.org/show_bug.cgi?id=660739
Make the options from an /etc/fstab entry available as public API -
this can be used to support options such as
comment=gvfs.name=Foo\040Bar
to e.g. set the name of an fstab mount in the UI to "Foo Bar".
https://bugzilla.gnome.org/show_bug.cgi?id=660536
Signed-off-by: David Zeuthen <davidz@redhat.com>
This reverts commit c841c2ce3f.
This approach has been an unmitigated disaster. We're getting all sorts
of crashes due to functions that are returning NULL because they can't
find the schema for the default value. The people who get these crashes
are then confused about the root cause of the problem and waste a lot of
time trying to figure it out.
Until we find a better solution, we should go back to what we had
before.
https://bugzilla.gnome.org/show_bug.cgi?id=655366
All locks are now zero-initialised, so we can drop the G_*_INIT macros
for them.
Adjust various users around GLib accordingly and change the docs.
https://bugzilla.gnome.org/show_bug.cgi?id=659866
Deprecate both g_thread_create functions and add
g_thread_new() and g_thread_new_full(). The new functions
expect a name for the thread.
Change GThreadPool, GMainContext and GDBus to create named threads.
https://bugzilla.gnome.org/show_bug.cgi?id=660635
GVDB deals with empty lists by returning NULL for the list instead of a
zero-length (non-NULL) strv. We can work around that in GSettingsSchema
by checking for the NULL case and treating it like a zero-length list.
https://bugzilla.gnome.org/show_bug.cgi?id=660147
On recent Linux distros /etc/mtab is just a symlink to /proc/mounts
and GFileMonitor does not work there because of how the kernel conveys
that the file changes.
https://bugzilla.gnome.org/show_bug.cgi?id=660511
Signed-off-by: David Zeuthen <davidz@redhat.com>
Previously, we took the default application for a particular mimetype
from the system and copied it into the user's configuration as the
default there.
Instead of doing that we leave the user's default unset, and at time of
use, if the user has no explicitly-set default value, we use the system
default.
This avoids complicated situations where inappropriate applications were
being set as the default in the user's configuration.
https://bugzilla.gnome.org/show_bug.cgi?id=658188
This tests the interaction between mimeinfo.cache, defaults.list and
mimeapps.list to ensure g_app_info_set_as_last_used_for_type doesn't
incorrectly change the default.
https://bugzilla.gnome.org/show_bug.cgi?id=658188
The documentation for G_TYPE_CHAR says:
"The type designated by G_TYPE_CHAR is unconditionally an 8-bit signed
integer."
However the return value for g_value_get_char() was just "char" which
in C has an unspecified signedness; on e.g. x86 it's signed (which
matches the GType), but on e.g. PowerPC or ARM, it's not.
We can't break the old API, so we need to suck it up and add new API.
Port most internal users, but keep some tests of the old API too.
https://bugzilla.gnome.org/show_bug.cgi?id=659870
Otherwise we might collide with an interface called Connection.
https://bugzilla.gnome.org/show_bug.cgi?id=659699
This is for the same reason that GDBusProxy has its properties
prefixed with g-.
Signed-off-by: David Zeuthen <davidz@redhat.com>
We ignore entries with mountpoint of "swap" and "ignore". Add "none" to
that list, since Debian uses it.
Probably we should move to using our already-existing internal list of
things to ignore, but this patch is more minimally intrusive for now.
https://bugzilla.gnome.org/show_bug.cgi?id=654563
Commit afa82ae805 introduced a compilation
regression on BSD systems that use the sysctl(3) interface; we need to
declare the buffer len in _g_get_unix_mount_points()
BZ #659528
In registration_data_export_interface(), the object_path is obtained using:
object_path = g_dbus_object_get_object_path (G_DBUS_OBJECT (data->object));
But when exporting an object uniquely, the object_path is not assigned
to the GDBusObject until after all the interfaces are exported.
Therefore, registration_data_export_interface() is trying to export
the interface on the non-unique object path, which can lead to
run-time errors if an object already exists on that path.
Instead, registration_data_export_interface() should be passed the
object_path explicitly, as is done in
g_dbus_object_manager_server_export_unlocked().
Signed-off-by: David Zeuthen <davidz@redhat.com>
Ensure that the output/target stream in a g_output_stream_splice_async()
operation is marked as closed if G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET is
passed to g_output_stream_splice_async(). This removes the possibility of
local FDs being closed twice because the stream's not marked as closed.
This is implemented by calling g_output_stream_close() from within
g_output_stream_splice_async() instead of calling the stream's close_fn()
directly.
Closes: bgo#659324
Otherwise, we could use-after-free the GDBusWorker, if its last-unref
is immediately after _g_dbus_worker_new returns (before the worker thread
does its initial read).
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=651268
Bug-NB: NB#271520
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: David Zeuthen <davidz@redhat.com>
This member is written in _g_dbus_worker_stop from arbitrary threads, and
read by the worker thread, so it should be accessed atomically.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=651268
Bug-NB: NB#271520
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: David Zeuthen <davidz@redhat.com>
We can't safely close the output part of the I/O stream until any
pending write or flush has been completed. In the worst case, this could
lead to an assertion failure in the worker (when the close wins the
race) or not closing the stream at all (when the write wins the race).
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=651268
Bug-NB: NB#271520
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: David Zeuthen <davidz@redhat.com>
num_writes_pending was a counter, but it only took values 0 or 1, so make
it a boolean: it would never make sense to be trying to write out two
messages at the same time (they'd get interleaved).
Similarly, we can never be writing and flushing at the same time (that'd
mean we were flushing halfway through a message, which would be pointless)
so combine it with flush_pending too, calling the result output_pending.
Also assert that it takes the expected value whenever we change it,
and document the locking discipline used for it, including a subtle
case in write_message_in_idle_cb where it's not obvious at first glance
why we don't need the lock.
(Having the combined boolean at the top of the block of write-related
struct members improves struct packing on 64-bit platforms, by packing
read_num_ancillary_messages and output_pending into one word.)
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=651268
Bug-NB: NB#271520
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Signed-off-by: David Zeuthen <davidz@redhat.com>
Add an extra state pointer and an extra GDestroyNotify function
to the 'Chunk' definition... allowing bindings to attach some extra
state to memory chunks (to get memory management correctly from
language bindings).
Bug #589887
The GApplication test case tried to fork() while using GMainLoop,
causing problems. Avoid doing that by splitting the child process into
a separate program and spawning it in the usual way.
https://bugzilla.gnome.org/show_bug.cgi?id=658999
The 'key' variable is no longer valid outside the cycle, owned and
probably already freed by GVariant. This causes apps to segfault
when proxy is constructed and a property on remote d-bus service
changes (actually is invalidated). Looks like a typo anyway.
https://bugzilla.gnome.org/show_bug.cgi?id=659070
