This is an attempt to make that section a little clearer. I don’t think
any factual inaccuracies have been fixed (because I couldn’t find any).
Including some wording and an example by Simon McVittie.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=93382
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
If dbus is running as systemd service, dbus daemon is running with
oom_score_adj -900 by OOMScoreAdjust=-900. And children will also have
same value with dbus daemon.
To avoid this, set the child itself values after fork () to 0.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=32851
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Some D-Bus daemon versions set multiple addresses separated by semi-colon,
which breaks sourcing of the file.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=94746
Signed-off-by: Thiago Macieira <thiago@kde.org>
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Some D-Bus daemon versions set multiple addresses separated by semi-colon,
which breaks sourcing of the file.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=94746
Signed-off-by: Thiago Macieira <thiago@kde.org>
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Also enable segfault checks on windows because the reason why it
has been disabled has been fixed with bug #95155.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=95191
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
This should detect anything that is only a build failure when embedded
tests or verbose mode are enabled, such as the missing include fixed
in commit 4858faf. I'm not enabling embedded tests and verbose mode
orthogonally because we don't want CI builds to take too long.
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>
(cherry picked from commit 8f6fe1451e)
This should detect anything that is only a build failure when embedded
tests or verbose mode are enabled, such as the missing include fixed
in commit 4858faf. I'm not enabling embedded tests and verbose mode
orthogonally because we don't want CI builds to take too long.
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>
Ensure that the babysitter thread already owns its one reference to the
babysitter when it starts up, and eliminates the race condition.
This patch requires that DBusBabysitter refcounting is thread-safe
and is based on an analysis and proposal of Simon Mc Vittie.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=95191
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Previously, the listen() backlog was set to an arbitrary 30. This means
that if dbus-daemon is overloaded only 30 more connections may be queued
by the kernel, before connect() fails with EAGAIN. (Note that EAGAIN !=
EINPROGRESS -- the latter is what is returned if a connection is queued
and being processed for asynchronous sockets; EAGAIN in this case is
really an error, that cannot be recovered from).
Most software simply sets SOMAXCONN as backlog for AF_UNIX sockets, to
allow queuing of as many connections as the kernel allows. SOMAXCONN is
128 on Linux, which is not particularly high, but at least higher than
30.
This patch changes dbus-daemon to do the same.
I noticed this when flooding dbus-daemon with a lot of connections,
where it pretty quickly ceased to respond, much earlier than it really
should.
Note that the backlog has nothing to do with the number of concurrent
connections allowed, it simply controls how many queued, but not
accept()ed connections there may be on the listening socket.
https://bugs.freedesktop.org/show_bug.cgi?id=95264
Previously, 64-bit (LP64 or LLP64) platforms would have had 32 bits
of padding between pad2 and pad3. We want to guarantee that an ISO C
compiler will copy the entire struct when assigning between structs,
but padding is not guaranteed to be copied, so we want to ensure that
the struct is "packed".
Statically assert that the old ABI is compatible with the new ABI.
Reviewed-by: Thiago Macieira <thiago@kde.org>
[smcv: change >= to == as Thiago requested]
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=94136
