C++ (Cpp) flush_read_buffer示例

示例#1

文件： file.c 项目： xricson/knoppix

static ssize_t
sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct sysfs_buffer * buffer = file->private_data;
	ssize_t retval = 0;

	if (!*ppos) {
		if ((retval = fill_read_buffer(file,buffer)))
			return retval;
	}
	pr_debug("%s: count = %d, ppos = %lld, buf = %s\n",
		 __FUNCTION__,count,*ppos,buffer->page);
	return flush_read_buffer(buffer,buf,count,ppos);
}

示例#2

static ssize_t
configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct configfs_buffer * buffer = file->private_data;
	ssize_t retval = 0;

	down(&buffer->sem);
	if (buffer->needs_read_fill) {
		if ((retval = fill_read_buffer(file->f_dentry,buffer)))
			goto out;
	}
	pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n",
		 __FUNCTION__, count, *ppos, buffer->page);
	retval = flush_read_buffer(buffer,buf,count,ppos);
out:
	up(&buffer->sem);
	return retval;
}