id_path 145 tools/testing/selftests/bpf/prog_tests/send_signal.c const char *id_path = "/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id"; id_path 156 tools/testing/selftests/bpf/prog_tests/send_signal.c efd = open(id_path, O_RDONLY, 0);