Ejemplos de __generic_file_splice_read en C++ (Cpp)

Ejemplo n.º 1

Archivo: splice.c Proyecto: xf739645524/kernel-rhel5

/**
 * generic_file_splice_read - splice data from file to a pipe
 * @in:		file to splice from
 * @pipe:	pipe to splice to
 * @len:	number of bytes to splice
 * @flags:	splice modifier flags
 *
 * Will read pages from given file and fill them into a pipe.
 */
ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
				 struct pipe_inode_info *pipe, size_t len,
				 unsigned int flags)
{
	ssize_t spliced;
	int ret;

	ret = 0;
	spliced = 0;

	while (len) {
		ret = __generic_file_splice_read(in, ppos, pipe, len, flags);

		if (ret < 0)
			break;
		else if (!ret) {
			if (spliced)
				break;
			if (flags & SPLICE_F_NONBLOCK) {
				ret = -EAGAIN;
				break;
			}
		}

		*ppos += ret;
		len -= ret;
		spliced += ret;
	}

	if (spliced)
		return spliced;

	return ret;
}

Ejemplo n.º 2

/**
 * generic_file_splice_read - splice data from file to a pipe
 * @in:		file to splice from
 * @pipe:	pipe to splice to
 * @len:	number of bytes to splice
 * @flags:	splice modifier flags
 *
 * Will read pages from given file and fill them into a pipe.
 */
ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
				 struct pipe_inode_info *pipe, size_t len,
				 unsigned int flags)
{
	ssize_t spliced;
	int ret;
	loff_t isize, left;

	isize = i_size_read(in->f_mapping->host);
	if (unlikely(*ppos >= isize))
		return 0;

	left = isize - *ppos;
	if (unlikely(left < len))
		len = left;

	ret = 0;
	spliced = 0;
	while (len) {
		ret = __generic_file_splice_read(in, ppos, pipe, len, flags);

		if (ret < 0)
			break;
		else if (!ret) {
			if (spliced)
				break;
			if (flags & SPLICE_F_NONBLOCK) {
				ret = -EAGAIN;
				break;
			}
		}

		*ppos += ret;
		len -= ret;
		spliced += ret;
	}

	if (spliced)
		return spliced;

	return ret;
}