BPF_MAP_GET_NEXT_KEY 1047 kernel/bpf/syscall.c if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) BPF_MAP_GET_NEXT_KEY 2876 kernel/bpf/syscall.c case BPF_MAP_GET_NEXT_KEY: BPF_MAP_GET_NEXT_KEY 428 tools/lib/bpf/bpf.c return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));