Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/core/bpf-util.c b/src/core/bpf-util.c
new file mode 100644
index 0000000..6fe229e
--- /dev/null
+++ b/src/core/bpf-util.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bpf-dlopen.h"
+#include "bpf-util.h"
+#include "cgroup-util.h"
+#include "initrd-util.h"
+#include "log.h"
+
+bool cgroup_bpf_supported(void) {
+        static int supported = -1;
+        int r;
+
+        if (supported >= 0)
+                return supported;
+
+        r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
+        if (r < 0) {
+                log_warning_errno(r, "Can't determine whether the unified hierarchy is used: %m");
+                return (supported = false);
+        }
+
+        if (r == 0) {
+                log_info_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                               "Not running with unified cgroup hierarchy, disabling cgroup BPF features.");
+                return (supported = false);
+        }
+
+        r = dlopen_bpf();
+        if (r < 0) {
+                log_full_errno(in_initrd() ? LOG_DEBUG : LOG_INFO,
+                               r, "Failed to open libbpf, cgroup BPF features disabled: %m");
+                return (supported = false);
+        }
+
+        return (supported = true);
+}