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static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk){ struct sighand_struct *sig;  if (clone_flags & CLONE_SIGHAND) {  atomic_inc(&current->sighand->count);  return 0; } sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); rcu_assign_pointer(tsk->sighand, sig); if (!sig)  return -ENOMEM;  atomic_set(&sig->count, 1); memcpy(sig->action, current->sighand->action, sizeof(sig->action)); return 0;}

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