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lib: introduce feature check in libcriu

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This commit adds feature check support to libcriu. It already exists in
the CLI and RPC and this just extends it to libcriu.

This commit provides one function to do all possible feature checks in
one call. The parameter to the feature check function is a structure and
the user can enable which features should be checked.

Using a structure makes the function extensible without the need to
break the API/ABI in the future.

Signed-off-by: Adrian Reber <areber@redhat.com>
This commit is contained in:
Adrian Reber
2021-12-06 16:51:21 +00:00
committed by Andrei Vagin
parent 4c4b2159de
commit b00b61f0e6
2 changed files with 101 additions and 0 deletions
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72
lib/c/criu.c
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@@ -1925,3 +1925,75 @@ int criu_join_ns_add(const char *ns, const char *ns_file, const char *extra_opt)
{
return criu_local_join_ns_add(global_opts, ns, ns_file, extra_opt);
}
int criu_local_feature_check(criu_opts *opts, struct criu_feature_check *features, size_t size)
{
CriuFeatures criu_features = CRIU_FEATURES__INIT;
struct criu_feature_check features_copy = { 0 };
CriuReq req = CRIU_REQ__INIT;
CriuResp *resp = NULL;
int ret = -1;
saved_errno = 0;
if (!features)
goto exit;
if (size > sizeof(struct criu_feature_check))
goto exit;
memcpy(&features_copy, features, size);
req.type = CRIU_REQ_TYPE__FEATURE_CHECK;
req.opts = opts->rpc;
if (features_copy.mem_track) {
criu_features.has_mem_track = true;
criu_features.mem_track = true;
}
if (features_copy.lazy_pages) {
criu_features.has_lazy_pages = true;
criu_features.lazy_pages = true;
}
if (features_copy.pidfd_store) {
criu_features.has_pidfd_store = true;
criu_features.pidfd_store = true;
}
req.features = &criu_features;
ret = send_req_and_recv_resp(opts, &req, &resp);
if (ret)
goto exit;
memset(&features_copy, 0, sizeof(struct criu_feature_check));
if (resp->success) {
if (resp->features->has_mem_track) {
features_copy.mem_track = resp->features->mem_track;
}
if (resp->features->has_lazy_pages) {
features_copy.lazy_pages = resp->features->lazy_pages;
}
if (resp->features->has_pidfd_store) {
features_copy.pidfd_store = resp->features->pidfd_store;
}
memcpy(features, &features_copy, size);
} else {
ret = -EBADE;
}
exit:
if (resp)
criu_resp__free_unpacked(resp, NULL);
swrk_wait(opts);
errno = saved_errno;
return ret;
}
int criu_feature_check(struct criu_feature_check *features, size_t size)
{
return criu_local_feature_check(global_opts, features, size);
}