wait_for_child
FAIL_IF(wait_for_child(pid));
FAIL_IF(wait_for_child(pid) != 2);
FAIL_IF(wait_for_child(pid));
FAIL_IF(wait_for_child(pid));
FAIL_IF(wait_for_child(pid));
FAIL_IF(wait_for_child(pid));
FAIL_IF(wait_for_child(pid));
rc |= wait_for_child(pids[i]);
FAIL_IF(wait_for_child(pid) != 2);
FAIL_IF(wait_for_child(pid));
return wait_for_child(child_pid);
extern int wait_for_child(pid_t child_pid);