CHILD_EXIT_CODE_OK
if (err != CHILD_EXIT_CODE_OK) {
log_err("%s: wrong exit_code %d != %d", __func__, err, CHILD_EXIT_CODE_OK);
exit(CHILD_EXIT_CODE_OK);
ASSERT_EQ(CHILD_EXIT_CODE_OK, WIFEXITED(child_status) ? WEXITSTATUS(child_status) : 1);