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Message handler callbacks can be simplified drastically if the
dispatcher automatically replies to method calls if errors are returned.
Thus: add an sd_bus_error argument to all message handlers. When we
dispatch a message handler and it returns negative or a set sd_bus_error
we send this as message error back to the client. This means errors
returned by handlers by default are given back to clients instead of
rippling all the way up to the event loop, which is desirable to make
things robust.
As a side-effect we can now easily turn the SELinux checks into normal
function calls, since the method call dispatcher will generate the right
error replies automatically now.
Also, make sure we always pass the error structure to all property and
method handlers as last argument to follow the usual style of passing
variables for return values as last argument.
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This patch converts PID 1 to libsystemd-bus and thus drops the
dependency on libdbus. The only remaining code using libdbus is a test
case that validates our bus marshalling against libdbus' marshalling,
and this dependency can be turned off.
This patch also adds a couple of things to libsystem-bus, that are
necessary to make the port work:
- Synthesizing of "Disconnected" messages when bus connections are
severed.
- Support for attaching multiple vtables for the same interface on the
same path.
This patch also fixes the SetDefaultTarget() and GetDefaultTarget() bus
calls which used an inappropriate signature.
As a side effect we will now generate PropertiesChanged messages which
carry property contents, rather than just invalidation information.
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If the session fifo is not created the session state written to
the session file is "closing". This caused the lock screen in
gnome-shell to go into a loop trying to find the active session.
The problem was introduced in the sd-bus port in
cc3773810855956bad92337cee8fa193584ab62e
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=71525
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everywhere
We want to emphasize bus connections as per-thread communication
primitives, hence introduce a concept of a per-thread default bus, and
make use of it everywhere.
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it everywhere
Try to emphasize a bit that there should be a mapping between event
loops and threads, hence introduce a logic that there's one "default"
event loop for each thread, that can be queried via
"sd_event_default()".
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The call is one of the most important ones we expose, where we place
major emphasis on. We should make sure to give it a short, memorable
name.
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"make check-api-unused" informs us about code that is not used anymore
or that is exported but only used internally. Fix these all over the
place.
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bus_log_parse_error()
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NOTE: the show-* subcommands do not print some properties:
this are those with types like (so), a(so), (uo),...
we need to fix this, but I'm not sure how
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Otherwise sd_bus_message cleanup would close it.
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systemd_pam would ignore all params after the first invalid one.
Instead ignore just this one, and parse the rest. There's just
one now, but as a matter of principle ;)
Also, allow debug as an alias for debug=1, and don't treat
invalid debug= options as fatal.
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Among other things this makes sure we always expose a --version command
and show it in the help texts.
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This way we can without races always determine the machine for a leader
PID. This allows machine managers to query the machine for a forked off
container/VM without a race where the child might already have died
before we could read the cgroup information from /proc/$PID/cgroup.
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callers session, user, seat or machine object
This way clients can skip invoking GetSessionByPID() for their own PID
or a similar call to access these objects.
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called with a PID == 0
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The session-device/control API was introduced for unprivileged device
access from within a session. Add the required dbus policy to the default
logind policies.
Note: logind validates that only root and the user of a session can
use the API. Furthermore, only a single API user gets access at a time.
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each invocation
We can determine the list entry type via the typeof() gcc construct, and
so we should to make the macros much shorter to use.
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Since the invention of read-only memory, write-only memory has been
considered deprecated. Where appropriate, either make use of the
value, or avoid writing it, to make it clear that it is not used.
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We use VTNR, not VTNr as key. Until now sd_session_get_vt() just returns
an error.
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We need to clear variables markes as _cleanup_free_. Otherwise, our
error-paths might corrupt random memory.
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fbdev does not support access-handover so it is quite useless to route it
through logind. If compositors want to use it they ought to open it
themselves. It's highly recommended to be ignored entirely, though. fbdev
is about to be deprecated in the kernel.
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