C++ (Cpp) vme_get_size Examples

Example #1

File: vme_user.c Project: mikeberkelaar/grhardened

static ssize_t vme_user_read(struct file *file, char *buf, size_t count,
			loff_t * ppos)
{
	unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
	ssize_t retval;
	size_t image_size;
	size_t okcount;

	down(&image[minor].sem);

	/* XXX Do we *really* want this helper - we can use vme_*_get ? */
	image_size = vme_get_size(image[minor].resource);

	/* Ensure we are starting at a valid location */
	if ((*ppos < 0) || (*ppos > (image_size - 1))) {
		up(&image[minor].sem);
		return 0;
	}

	/* Ensure not reading past end of the image */
	if (*ppos + count > image_size)
		okcount = image_size - *ppos;
	else
		okcount = count;

	switch (type[minor]){
	case MASTER_MINOR:
		retval = resource_to_user(minor, buf, okcount, ppos);
		break;
	case SLAVE_MINOR:
		retval = buffer_to_user(minor, buf, okcount, ppos);
		break;
	default:
		retval = -EINVAL;
	}

	up(&image[minor].sem);

	if (retval > 0)
		*ppos += retval;

	return retval;
}

Example #2

File: vme_user.c Project: flwh/Alcatel_OT_985_kernel

static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
{
	loff_t absolute = -1;
	unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
	size_t image_size;

	down(&image[minor].sem);
	image_size = vme_get_size(image[minor].resource);

	switch (whence) {
	case SEEK_SET:
		absolute = off;
		break;
	case SEEK_CUR:
		absolute = file->f_pos + off;
		break;
	case SEEK_END:
		absolute = image_size + off;
		break;
	default:
		up(&image[minor].sem);
		return -EINVAL;
		break;
	}

	if ((absolute < 0) || (absolute >= image_size)) {
		up(&image[minor].sem);
		return -EINVAL;
	}

	file->f_pos = absolute;

	up(&image[minor].sem);

	return absolute;
}