_child
void (*_child)(void), void *_dso);
CALLBACK(otherf, name##_child)
REGISTER(name##_prepare, name##_parent, name##_child)
void cpu_fork(struct proc *_curp, struct proc *_child, void *_stack,
void process_reparent(struct process *_child, struct process *_newparent);
struct _child *c_next; /* Next entry */
typedef struct _child CHILD;