EMPTYPATH_TEST_FILE
fd = open(EMPTYPATH_TEST_FILE, O_CREAT | O_WRONLY, S_IRWXU);
TH_LOG("create %s: %s", EMPTYPATH_TEST_FILE, strerror(errno));
self->opath_fd = open(EMPTYPATH_TEST_FILE, O_PATH);
TH_LOG("open %s O_PATH: %s", EMPTYPATH_TEST_FILE, strerror(errno));
unlink(EMPTYPATH_TEST_FILE);