extern int show_unhandled_signals;
extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
+extern void block_sigmask(struct k_sigaction *ka, int signr);
extern void exit_signals(struct task_struct *tsk);
extern struct kmem_cache *sighand_cachep;