C++ (Cpp) iov_iter_iovec Beispiele

Beispiel #1

Datei: read_write.c Projekt: 020gzh/linux

/* Do it by hand, with file-ops */
static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
		loff_t *ppos, io_fn_t fn, int flags)
{
	ssize_t ret = 0;

	if (flags & ~RWF_HIPRI)
		return -EOPNOTSUPP;

	while (iov_iter_count(iter)) {
		struct iovec iovec = iov_iter_iovec(iter);
		ssize_t nr;

		nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos);

		if (nr < 0) {
			if (!ret)
				ret = nr;
			break;
		}
		ret += nr;
		if (nr != iovec.iov_len)
			break;
		iov_iter_advance(iter, nr);
	}

	return ret;
}

Beispiel #2

Datei: read_write.c Projekt: Anjali05/linux

/* Do it by hand, with file-ops */
static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
		loff_t *ppos, int type, rwf_t flags)
{
	ssize_t ret = 0;

	if (flags & ~RWF_HIPRI)
		return -EOPNOTSUPP;

	while (iov_iter_count(iter)) {
		struct iovec iovec = iov_iter_iovec(iter);
		ssize_t nr;

		if (type == READ) {
			nr = filp->f_op->read(filp, iovec.iov_base,
					      iovec.iov_len, ppos);
		} else {
			nr = filp->f_op->write(filp, iovec.iov_base,
					       iovec.iov_len, ppos);
		}

		if (nr < 0) {
			if (!ret)
				ret = nr;
			break;
		}
		ret += nr;
		if (nr != iovec.iov_len)
			break;
		iov_iter_advance(iter, nr);
	}

	return ret;
}