stackid 104 samples/bpf/trace_event_user.c __u32 stackid = 0, next_id; stackid 121 samples/bpf/trace_event_user.c while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) { stackid 123 samples/bpf/trace_event_user.c stackid = next_id;