_thread_atfork
int _thread_atfork(void (*)(void), void (*)(void), void (*)(void), void *)
return (_thread_atfork(prep, parent, child, &__dso_handle));
int _thread_atfork(void (*_prepare)(void), void (*_parent)(void),
PROTO_NORMAL(_thread_atfork);
DEF_STRONG(_thread_atfork);
return (_thread_atfork(prep, parent, child, NULL));