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Coverity doesn't like the fact that unit_get_cgroup_context() returns NULL for
unit types that don't have a CGroupContext. We don't expect to call those
functions with such unit types, so this isn't an immediate problem, but we can
make things more robust by handling this case.
CID #1400683, #1400684.
- bridge or bonding master takes a reference of slave links.
- drop link from bridge or bonding master's slave list when slave link
is removed.
- change type of Link::slaves to Set*,
Fixes#12315.
When a uevent is received during the relevant interface is in
LINK_STATE_PENDING, then the interface may be initialized twice.
To prevent that, this introduces LINK_STATE_INITIALIZED.
https://github.com/systemd/systemd/issues/7153#issuecomment-485252308
Apparently this is still confusing for people.
Longer-term, I think we should just make BindMount= automatically "upgrade"
(or "downgrade", depending on how you look at this), any InaccessiblePath=
mountpoints to "tmpfs". I don't see much point in forcing users to remember
this interaction. But let's at least document the status quo, we can always
update the docs if the code changes.
A service might be able to detect errors by itself that may require the
system to take the same action as if the service locked up. Add a
WATCHDOG=trigger state change notification to sd_notify() to let the
service manager know about the self-detected misery and instantly
trigger the configured watchdog behaviour.
This wraps a few common steps. It is defined as inline function instead of in a
.c file to avoid having a .c file. With a .c file, we would have three choices:
- either link it into libshared, but then then libshared would have to be
linked to libmount.
- or compile the .c file into each target separately. This has the disdvantage
that configuration of every target has to be updated and stuff will be compiled
multiple times anyway, which is not too different from keeping this in the
header file.
- or create a new convenience library just for this. This also has the disadvantage
that the every target would have to be updated, and a separate library for a
10 line function seems overkill.
By keeping everything in a header file, we compile this a few times, but
otherwise it's the least painful option. The compiler can optimize most of the
function away, because it knows if 'source' is set or not.
Same motivation as in other places: let's use a single logic to parse this.
Use path_equal() to compare the path.
A bug in error handling is fixed: if we failed after the GREEDY_REALLOC but
before the line that sets the last item to NULL, we would jump to
_cleanup_strv_free_ with the strv unterminated. Let's use GREEDY_REALLOC0
to avoid the issue.
It seems better to use just a single parsing algorithm for /proc/self/mountinfo.
Also, unify the naming of variables in all places that use mnt_table_next_fs().
It makes it easier to compare the different call sites.
The interface provided by those two functions is huge, so this text could
probably be made two or three times as long if all details were described.
But I think it's a good start.
This wraps the call to org.freedesktop.DBus.Introspectable.Introspect.
Using "busctl call" directly is inconvenient because busctl escapes the
string before printing.
Example:
$ busctl introspect --xml org.freedesktop.systemd1 /org/freedesktop/systemd1 | pygmentize -lxml | less -RF
test-bus-introspect is also applied to the tables from test-bus-vtable.c.
test-bus-vtable.c is also used as C++ sources to produce test-bus-vtable-cc,
and our hashmap headers are not C++ compatible. So let's do the introspection
part only in the C version.
In order to properly and predictably name netdevsim netdevices,
introduce a separate implementation, as the netdevices reside on a
specific netdevsim bus. Note that this applies only to netdevsim devices
created using sysfs, because those expose phys_port_name attribute.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Just moving code around, in preparation to allow the content creation
part to be used in other places.
On the surface of things, introspect_path() should be in bus-introspect.c, but
introspect_path() uses many static helper functions in bus-objects.c, so moving
it would require all of them to be exposed, which is too much trouble.
test-bus-introspect is updated to actually write the closing bracket.
We would check the size of sd_bus_vtable entries, requring one of the two known
sizes. But we should be able to extend the structure in the future, by adding
new fields, without breaking backwards compatiblity.
Incidentally, this check was what caused -EINVAL failures before, when programs
were compiled with systemd-242 and run with older libsystemd.
In 856ad2a86b sd_bus_add_object_vtable() and
sd_bus_add_fallback_vtable() were changed to take an updated sd_bus_vtable[]
array with additional 'features' and 'names' fields in the union.
The commit tried to check whether the old or the new table format is used, by
looking at the vtable[0].x.start.element_size field, on the assumption that the
added fields caused the structure size to grow. Unfortunately, this assumption
was false, and on arm32 (at least), the structure size is unchanged.
In libsystemd we use symbol versioning and a major.minor.patch semantic
versioning of the library name (major equals the number in the so-name). When
systemd-242 was released, the minor number was (correctly) bumped, but this is
not enough, because no new symbols were added or symbol versions changed. This
means that programs compiled with the new systemd headers and library could be
successfully linked to older versions of the library. For example rpm only
looks at the so-name and the list of versioned symbols, completely ignoring the
major.minor numbers in the library name. But the older library does not
understand the new vtable format, and would return -EINVAL after failing the
size check (on those architectures where the structure size did change, i.e.
all 64 bit architectures).
To force new libsystemd (with the functions that take the updated
sd_bus_vtable[] format) to be used, let's pull in a dummy symbol from the table
definition. This is a bit wasteful, because a dummy pointer has to be stored,
but the effect is negligible. In particular, the pointer doesn't even change
the size of the structure because if fits in an unused area in the union.
The number stored in the new unsigned integer is not checked anywhere. If the
symbol exists, we already know we have the new version of the library, so an
additional check would not tell us anything.
An alternative would be to make sd_bus_add_{object,fallback}_vtable() versioned
symbols, using .symver linker annotations. We would provide
sd_bus_add_{object,fallback}_vtable@LIBSYSTEMD_221 (for backwards
compatibility) and e.g. sd_bus_add_{object,fallback}_vtable@@LIBSYSTEMD_242
(the default) with the new implementation. This would work too, but is more
work. We would have to version at least those two functions. And it turns out
that the .symver linker instructions have to located in the same compilation
unit as the function being annotated. We first compile libsystemd.a, and then
link it into libsystemd.so and various other targets, including
libsystemd-shared.so, and the nss modules. If the .symver annotations were
placed next to the function definitions (in bus-object.c), they would influence
all targets that link libsystemd.a, and cause problems, because those functions
should not be exported there. To export them only in libsystemd.so, compilation
would have to be rearranged, so that the functions exported in libsystemd.so
would not be present in libsystemd.a, but a separate compilation unit containg
them and the .symver annotations would be linked solely into libsystemd.so.
This is certainly possible, but more work than the approach in this patch.
856ad2a86b has one more issue: it relies on the
undefined fields in sd_bus_vtable[] array to be zeros. But the structure
contains a union, and fields of the union do not have to be zero-initalized by
the compiler. This means that potentially, we could have garbarge values there,
for example when reading the old vtable format definition from the new function
implementation. In practice this should not be an issue at all, because vtable
definitions are static data and are placed in the ro-data section, which is
fully initalized, so we know that those undefined areas will be zero. Things
would be different if somebody defined the vtable array on the heap or on the
stack. Let's just document that they should zero-intialize the unused areas
in this case.
The symbol checking code had to be updated because otherwise gcc warns about a
cast from unsigned to a pointer.
