- * Called with irqs disabled, returns true if childs should reap themselves.
- */
-static int ignoring_children(struct sighand_struct *sigh)
-{
- int ret;
- spin_lock(&sigh->siglock);
- ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
- (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
- spin_unlock(&sigh->siglock);
- return ret;
-}
-
-/* Returns nonzero if the tracee should be released. */
-int __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
-{
- __ptrace_unlink(p);
-
- if (p->exit_state != EXIT_ZOMBIE)
- return 0;
- /*
- * If it's a zombie, our attachedness prevented normal
- * parent notification or self-reaping. Do notification
- * now if it would have happened earlier. If it should
- * reap itself we return true.
- *
- * If it's our own child, there is no notification to do.
- * But if our normal children self-reap, then this child
- * was prevented by ptrace and we must reap it now.
- */
- if (!task_detached(p) && thread_group_empty(p)) {
- if (!same_thread_group(p->real_parent, tracer))
- do_notify_parent(p, p->exit_signal);
- else if (ignoring_children(tracer->sighand))
- p->exit_signal = -1;
- }
-
- if (!task_detached(p))
- return 0;
-
- /* Mark it as in the process of being reaped. */
- p->exit_state = EXIT_DEAD;
- return 1;
-}
-
-/*
- * Detach all tasks we were using ptrace on.
- * Any that need to be release_task'd are put on the @dead list.
- *
- * Called with write_lock(&tasklist_lock) held.
- */
-static void ptrace_exit(struct task_struct *parent, struct list_head *dead)
-{
- struct task_struct *p, *n;
-
- list_for_each_entry_safe(p, n, &parent->ptraced, ptrace_entry) {
- if (__ptrace_detach(parent, p))
- list_add(&p->ptrace_entry, dead);
- }
-}
-
-/*
- * Finish up exit-time ptrace cleanup.
- *
- * Called without locks.
- */
-static void ptrace_exit_finish(struct task_struct *parent,
- struct list_head *dead)
-{
- struct task_struct *p, *n;
-
- BUG_ON(!list_empty(&parent->ptraced));
-
- list_for_each_entry_safe(p, n, dead, ptrace_entry) {
- list_del_init(&p->ptrace_entry);
- release_task(p);
- }
-}
-
-static void reparent_thread(struct task_struct *p, struct task_struct *father)
-{
- if (p->pdeath_signal)
- /* We already hold the tasklist_lock here. */
- group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
-
- list_move_tail(&p->sibling, &p->real_parent->children);
-
- if (task_detached(p))
- return;
- /* If this is a threaded reparent there is no need to
- * notify anyone anything has happened.
- */
- if (same_thread_group(p->real_parent, father))
- return;
-
- /* We don't want people slaying init. */
- p->exit_signal = SIGCHLD;
-
- /* If we'd notified the old parent about this child's death,
- * also notify the new parent.
- */
- if (!p->ptrace &&
- p->exit_state == EXIT_ZOMBIE && thread_group_empty(p))
- do_notify_parent(p, p->exit_signal);
-
- kill_orphaned_pgrp(p, father);
-}
-
-/*