Function proc_reparent

freebsd/kern/kern_exit.c:1378–1401

* Make process 'parent' the new parent of process 'child'. * Must be called with an exclusive hold of proctree lock. */

 * Must be called with an exclusive hold of proctree lock.
 */
void
proc_reparent(struct proc *child, struct proc *parent, bool set_oppid)
{

	sx_assert(&proctree_lock, SX_XLOCKED);
	PROC_LOCK_ASSERT(child, MA_OWNED);
	if (child->p_pptr == parent)
		return;

	PROC_LOCK(child->p_pptr);
	sigqueue_take(child->p_ksi);
	PROC_UNLOCK(child->p_pptr);
	LIST_REMOVE(child, p_sibling);
	LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);

	proc_clear_orphan(child);
	if ((child->p_flag & P_TRACED) != 0) {
		proc_add_orphan(child, child->p_pptr);
	}

	child->p_pptr = parent;
	if (set_oppid)
		child->p_oppid = parent->p_pid;
}