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As sd_device_get_sysattr_value() may be already used to read uevent
file. The read value of uevent file may be usually quite different
from the action string.
There are three calls of device_cache_sysattr_value(). Two of them are
just caching the value. Hence, let's ignore its failure, and propagate
original error code.
One exception is the last call in sd_device_get_sysattr_value().
Unfortunately, it returns `const char *` instead of `char *`. So,
sd_device object must have the reference of the returned value.
Hence, error in updating the cache by device_cache_sysattr_value()
is critical, and we need to propagate the error in that case.
It is not intuitive, and I do not know why the function behave so.
But let's keep that behavior for compatibility, as such behavior
may be already used explicitly by callers.
sd_bus_get_fd() and related calls are useful for integrating a bus
connection into arbitrary event loops. But sd_bus_set_fd() is quite a
different beast, it's for using D-Bus over pre-initialized sockets or
pairs of fifos or stuff, i.e. very advanced stuff.
Let's split this man page in two, in order not to confuse things
needlessly.
And while we are at it, let's slightly extend the documentation.
argv[0] might be prefixed by a path, and we shouldn't get confused by
that. Hence provide a simple helper call that abstracts the checking
away, which we can use everywhere, and expose the same behaviour, even
if argv[0] is not set.
(While we are at it, port all other multi-call binaries over to the new
helper, too)
Follow-up for: d41a9e4fc1
freep() has it's own definition, so I missed it in fd421c4adc.
Again, there is a small growth, but the compiler should be able to optimize it away:
-Dbuildtype=debug:
-rwxrwxr-x 1 zbyszek zbyszek 4106816 Feb 19 12:52 build/libsystemd.so.0.30.0
-rwxrwxr-x 1 zbyszek zbyszek 7492952 Feb 19 12:52 build/src/shared/libsystemd-shared-247.so
-rwxrwxr-x 1 zbyszek zbyszek 4472624 Feb 19 12:53 build/systemd
-rwxrwxr-x 1 zbyszek zbyszek 4107056 Feb 19 13:03 build/libsystemd.so.0.30.0
-rwxrwxr-x 1 zbyszek zbyszek 7493480 Feb 19 13:03 build/src/shared/libsystemd-shared-247.so
-rwxrwxr-x 1 zbyszek zbyszek 4472760 Feb 19 13:03 build/systemd
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31055.
See https://wiki.gnome.org/HowDoI/DBusApplicationLaunching and
https://wiki.gnome.org/Initiatives/GnomeGoals/DBusActivatable for a description
of this key:
> Instead of the typical UNIX-style fork()/exec() approach to process creation,
> launching an application is done by sending a D-Bus message to the well-known
> name of that application, causing a D-Bus activation.
>
> Starting processes with D-Bus activation ensures that each application gets
> started in its own pristine environment, as a direct descendent of the
> session -- not in the environment of whatever its parent happened to be. This
> is important for ensuring the app ends up in the correct cgroup, for example.
So this motivation is not important for us: we launch stuff ourselves better.
This fixes warnings during boot:
systemd-xdg-autostart-generator[2274]: /etc/xdg/autostart/org.freedesktop.problems.applet.desktop:92: Unknown key name 'DBusActivatable' in section 'Desktop Entry', ignoring.
