| /* 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); |
| } |