关于Linux内核copy_to_user的问题

[qq_33329896]

我写了一个Linux的内核代码，现在要将内核中结构体数组送到用户中去，但是老是报错，求大神帮看一下代码。。。。

int sys_ptreecall(struct prinfo __user *buf, int nr)
{
	n=0;
	struct prinfo buff[nr];
	printk("%d\n",sizeof(buff));
	struct task_struct *p,*tmp;
	read_lock(&tasklist_lock);
	int j;
	p=&init_task;
	for_each_process(p)
	{
		buff[p->pid].pid=p->pid;
		printk("%d\t",buff[p->pid].pid);
		j=0;
		for(;j<16;j++)
		{
			if(p->comm[j] == '\0')
			{
				buff[p->pid].comm[j] = '\0';
				break;
			}
			else
				buff[p->pid].comm[j] = p->comm[j];
		}

		printk("%s\t",&(buff[p->pid].comm));
		
		buff[p->pid].state=p->state;
		printk("%d\t",buff[p->pid].state);
		
		buff[p->pid].parent_pid=p->parent->pid;
		printk("%d\n",buff[p->pid].parent_pid);
		
		tmp=list_entry(p,struct task_struct,children);
		buff[p->pid].first_child_pid=tmp->pid;

		tmp=list_entry(p,struct task_struct,sibling);
		buff[p->pid].next_sibling_pid=tmp->pid;

		buff[p->pid].uid=p->cred->uid;

		//p=next_task(p);
	}
	read_unlock(&tasklist_lock);
	//printk("success unlock\n");
	//traverse(buf,1);
	if(copy_to_user((struct prinfo *)buf,buff,sizeof(buff)))
	{
		printk("fail\n");
		return 0;
	}
	return 0;
}

[小陆zi]

if(copy_to_user((struct prinfo *)buf,buff,sizeof(buff))) 你的意思是拷贝16个prinfo吧？ if(copy_to_user((struct prinfo *)buf,buff【0】,sizeof(buff))) if(copy_to_user((struct prinfo *)buf,buff【0】,sizeof(buff))) if(copy_to_user((struct prinfo *)buf,buff【0】,sizeof(buff)))

[InsaneCode]

报错是指什么意思,编译出错吗？如果是把编译出错的信息贴出来看看，要不大家就要一行一行看啊