notify_parent
bool notify_parent = false;
notify_parent = !parent->power.ignore_children;
if (notify_parent)
FAIL_IF(notify_parent(write_pipe));
FAIL_IF(notify_parent(write_pipe));
FAIL_IF(notify_parent(write_pipe));
FAIL_IF(notify_parent(write_pipe));
FAIL_IF(notify_parent(write_pipe));
FAIL_IF(notify_parent(write_pipe));
notify_parent(write_pipe);
extern int notify_parent(union pipe write_pipe);