Eventually, we should replace our uses of libgsystem's gsystem-local-alloc.h
by glib's g_auto*. As a first tiny step, add a compat implementation for g_autofree,
so that we could at least go ahead and use it instead of gs_free.
https://bugzilla.gnome.org/show_bug.cgi?id=794294
Previously, NM_PTRARRAY_LEN() would not work if the pointer type is
an opaque type, which is common. For example:
NMConnection *const*connections = ...;
Add an alternative to g_clear_pointer(). The differences are:
- nm_clear_pointer() is more type safe as it does not cast neither the
pointer nor the destroy function. Commonly, the types should be compatible
and not requiring a cast. Casting in the macro eliminates some of the
compilers type checking. For example, while
g_clear_pointer (&priv->hash_table, g_ptr_array_unref);
compiles, nm_clear_pointer() would prevent such an invalid use.
- also, clear the destination pointer *before* invoking the destroy
function. Destroy might emit signals (like weak-pointer callbacks
of GArray clear functions). Clear the destination first, so that
we don't leave a dangling pointer there.
- return TRUE/FALSE depending on whether there was a pointer to clear.
I tested that redefining g_clear_pointer()/g_clear_object() with our
more typesafe nm_* variants still compiles and indicates no bugs. So
that is good. It's not really expected that turning on more static checks
would yield a large number of bugs, because generally our code is in a good
shape already. We have few such bugs, because we already turn all all warnings
and extra checks that make sense. That however is not an argument for
not introducing (and using) a more resticted implementation.
It's slightly more correct to first clear the pointer location
before invoking the destroy function. The destroy function might
emit other callbacks, and at a certain point the pointer becomes
dangling. Avoid this danling pointer, by first clearing the
memory, and then destroing the instance.
Add macros that cast away the constness of a pointer, but
ensure that the type of the pointer is as expected.
Unfortunately, there is no way (AFAIK) to remove the constness of
a variable, without explicitly passing @type to the macro.
GCC 8.0's -Wcast-function-type objects casting function pointers to ones
with incompatible prototypes. Sometimes we do that on purpose though.
Notably, the g_source_set_callback()'s func argument can point to functions
of various prototypes. Also, libnm-glib/nm-remote-connection is perhaps
just not worth reworking, that would just be a waste of time.
A cast to void(*)(void) avoids the GCC warning, let's use it.
This makes its prototype compatible with GDestroyNotify so that GCC 8.0
won't warn.
The return value is not used anywhere and the unref() functions typically
don't return any.
When pushing a warning disable with clang, always disable
-Wunknown-warning-option first -- it might be that clang wouldn't warn
of what we're trying to disable because it doesn't recognize it in the
first place. That is entierely okay.
With clang-5.0.0:
CC libnm/tests/libnm_tests_test_secret_agent-test-secret-agent.o
In file included from libnm/tests/test-secret-agent.c:29:
In file included from ./shared/nm-test-libnm-utils.h:23:
./shared/nm-utils/nm-test-utils.h:432:3: error: unknown warning group '-Wunused-but-set-variable', ignored [-Werror,-Wunknown-warning-option]
NM_PRAGMA_WARNING_DISABLE("-Wunused-but-set-variable")
^
./shared/nm-utils/nm-macros-internal.h:223:9: note: expanded from macro 'NM_PRAGMA_WARNING_DISABLE'
_Pragma(_NM_PRAGMA_WARNING_DO(warning))
^
<scratch space>:204:25: note: expanded from here
GCC diagnostic ignored "-Wunused-but-set-variable"
^
1 error generated.
NM_API_VERSION is a better name. It's not the current stable
version, but the version number of the API which the current
NM_VERSION provides. In practice, NM_API_VERSION is either identical
to NM_VERSION (in case of a release) or NM_VERSION is a development
version leading up the the upcoming NM_API_VERSION.
For example, with the new name the check
#if NM_VERSION != NM_API_VERSION
# warning this is an development version
#endif
makes more sense.
We have a well defined versioning scheme and a defined way how
the version number indicates a stable version. We can simply
calculate NM_VERSION_CUR_STABLE based on the version numbers.
It already defaults to the right value. We only need to define
NM_VERSION_MIN_REQUIRED, so that parts of our internal build
can make use of deprecated API.
We don't need to have two version defines "CUR" and "NEXT".
The main purpose of these macros (if not their only), is to
make NM_AVAILABLE_IN_* and NM_DEPRECATED_IN_* macros work.
1) At the precise commit of a release, "CUR" and "NEXT" must be identical,
because whenever the user configures NM_VERSION_MIN_REQUIRED and
NM_VERSION_MAX_ALLOWED, then they both compare against the current
version, at which point "CUR" == "NEXT".
2) Every other commit aside the release, is a development version that leads
up the the next coming release. But as far as versioning is concerned, such
a development version should be treated like that future release. It's unstable
API and it may or may not be close to later API of the release. But
we shall treat it as that version. Hence, also in this case, we want to
set both "NM_VERSION_CUR_STABLE" and again NEXT to the future version.
This makes NM_VERSION_NEXT_STABLE redundant.
Previously, the separation between current and next version would for
example allow that NM_VERSION_CUR_STABLE is the previously release
stable API, and NM_VERSION_NEXT_STABLE is the version of the next upcoming
stable API. So, we could allow "examples" to make use of development
API, but other(?) internal code still restrict to unstable API. But it's
unclear which other code would want to avoid current development.
Also, the points 1) and 2) were badly understood. Note that for our
previousy releases, we usually didn't bump the macros at the stable
release (and if we did, we didn't set them to be the same). While using
two macros might be more powerful, it is hard to grok and easy to
forget to bump the macros a the right time. One macro shall suffice.
All this also means, that *immediately* after making a new release, we shall
bump the version number in `configure.ac` and "NM_VERSION_CUR_STABLE".
Some targets are missing dependencies on some generated sources in
the meson port. These makes the build to fail due to missing source
files on a highly parallelized build.
These dependencies have been resolved by taking advantage of meson's
internal dependencies which can be used to pass source files,
include directories, libraries and compiler flags.
One of such internal dependencies called `core_dep` was already in
use. However, in order to avoid any confusion with another new
internal dependency called `nm_core_dep`, which is used to include
directories and source files from the `libnm-core` directory, the
`core_dep` dependency has been renamed to `nm_dep`.
These changes have allowed minimizing the build details which are
inherited by using those dependencies. The parallelized build has
also been improved.
A cmp() implementation, for sorting an array with pointers, where each
pointer is an inteter according to GPOINTER_TO_INT().
That cames for example handy, if you have a GHashTable with keys
GINT_TO_POINTER(). Then you get the list of keys via
g_hash_table_get_keys_as_array() and want to sort them.
Sometimes, we want to use CList to track a simple data item. But contrary
to GList/GSList, we need to define a structure to hold the data pointer
and the CList member.
Add a generic NMCListElem type that can be used for such simple uses.
Before you ask: why not use GList/GSList? Because even simple operations
like g_list_append() is O(n), which kinda defeats the purpose of having
a doubly linked list.
This code is added to a new header file nm-c-list.h, the reason is that
there is no other good place:
- "nm-utils/c-list.h" is a clone of upstream, it should not deviate.
- "nm-utils/c-list-util.h" contains our utils functions for c-list.h
but should be plain C, independent of glib.
- "nm-utils/nm-shared-utils.h" contains our glib related utilities,
but it should not drag in "c-list.h".
So, "nm-c-list.h" is a utility libray that extends "c-list.h" and
requires glib.
Note that:
- we compile some source files multiple times. Most notably those
under "shared/".
- we include a default header "shared/nm-default.h" in every source
file. This header is supposed to setup a common environment by defining
and including parts that are commonly used. As we always include the
same header, the header must behave differently depending
one whether the compilation is for libnm-core, NetworkManager or
libnm-glib. E.g. it must include <glib/gi18n.h> or <glib/gi18n-lib.h>
depending on whether we compile a library or an application.
For that, the source files need the NETWORKMANAGER_COMPILATION #define
to behave accordingly.
Extend the define to be composed of flags. These flags are all named
NM_NETWORKMANAGER_COMPILATION_WITH_*, they indicate which part of the
build are available. E.g. when building libnm-core.la itself, then
WITH_LIBNM_CORE, WITH_LIBNM_CORE_INTERNAL, and WITH_LIBNM_CORE_PRIVATE
are available. When building NetworkManager, WITH_LIBNM_CORE_PRIVATE
is not available but the internal parts are still accessible. When
building nmcli, only WITH_LIBNM_CORE (the public part) is available.
This granularily controls the build.
This is still the very same approach (in the way the array is split
and how elements are compared). The only difference is that the
recursive implementation is replaced by a non-recursive one.
It's (still) stable, top-down merge-sort.
The non-recursive implementation better, because it avoids the overhead
of the function call to recurse.
The compat implementations return a (transfer none) strv instead of a
(transfer container) one. This has caused double frees in nm-applet:
https://bugs.archlinux.org/task/56772
Don't copy the keys and don't free the container later.
[thaller@redhat.com: patch adjusted to avoid compiler warning]
Fixes: 272439cb20
At several places we create strv arrays where the
strings themself are not deep-copied.
This helper function iterates over such an "const char **"
array, clones the strings, and updates the strv array
inplace to be a "char **" strv array.
This helper function is to reduce code duplication.
At various places we get the (string) keys of a GHashTable.
Add a helper function that does that, including an argument
for optional sorting.
The helper function is there to get reduce code duplication.
Systemd instroduces a macro _fallthrough_, see
https://github.com/systemd/systemd/pull/7389.
However, it does not yet seem conclusive how to
handle this properly in ever situation.
While shared/nm-utils/siphash24.c makes use of
the new macro, don't do that in our fork. siphash24.h
does not include all systemd headers, hence _fallthrough_
is not defined. We could re-implement it as _nm_fallthrough,
but given the open questions, that doesn't seem the
Systemd introduced a _fallthrough_ macro in
https://github.com/systemd/systemd/pull/7389.
There might still be some issue with it, but as
I am going to re-import the latest systemd code,
we get them too.
We need it, because "shared/nm-utils/siphash24.c"
will use it too, and that source file does not include
the other systemd macros. So, we will need to re-define
it.
