267 static bool iov_empty(const struct iovec iov[], unsigned int num_iov)  in iov_empty()  argument
272 		if (iov[i].iov_len)  in iov_empty()
279 			struct iovec iov[], unsigned num_iov,  in iov_consume()  argument
287 		used = iov[i].iov_len < len ? iov[i].iov_len : len;  in iov_consume()
289 			memcpy(dest, iov[i].iov_base, used);  in iov_consume()
292 		iov[i].iov_base += used;  in iov_consume()
293 		iov[i].iov_len -= used;  in iov_consume()
737 				 struct iovec iov[],  in wait_for_vq_desc()  argument
882 		iov[*out_num + *in_num].iov_len = desc[i].len;  in wait_for_vq_desc()
883 		iov[*out_num + *in_num].iov_base  in wait_for_vq_desc()
954 	struct iovec iov[vq->vring.num];  in console_input()  local
957 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in console_input()
962 	len = readv(STDIN_FILENO, iov, in_num);  in console_input()
985 	if (len != 1 || ((char *)iov[0].iov_base)[0] != 3) {  in console_input()
1007 	struct iovec iov[vq->vring.num];  in console_output()  local
1010 	head = wait_for_vq_desc(vq, iov, &out, &in);  in console_output()
1015 	while (!iov_empty(iov, out)) {  in console_output()
1016 		int len = writev(STDOUT_FILENO, iov, out);  in console_output()
1021 		iov_consume(vq->dev, iov, out, NULL, len);  in console_output()
1045 	struct iovec iov[vq->vring.num];  in net_output()  local
1048 	head = wait_for_vq_desc(vq, iov, &out, &in);  in net_output()
1055 	if (writev(net_info->tunfd, iov, out) < 0)  in net_output()
1089 	struct iovec iov[vq->vring.num];  in net_input()  local
1096 	head = wait_for_vq_desc(vq, iov, &out, &in);  in net_input()
1111 	len = readv(net_info->tunfd, iov, in);  in net_input()
2941 	struct iovec iov[vq->vring.num];  in blk_request()  local
2948 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in blk_request()
2951 	iov_consume(vq->dev, iov, out_num, &out, sizeof(out));  in blk_request()
2956 		if (iov[i].iov_len > 0) {  in blk_request()
2957 			in = iov[i].iov_base + iov[i].iov_len - 1;  in blk_request()
2958 			iov[i].iov_len--;  in blk_request()
2981 		ret = writev(vblk->fd, iov, out_num);  in blk_request()
3014 		ret = readv(vblk->fd, iov + out_num, in_num);  in blk_request()
3081 	struct iovec iov[vq->vring.num];  in rng_input()  local
3084 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in rng_input()
3092 	while (!iov_empty(iov, in_num)) {  in rng_input()
3093 		len = readv(rng_info->rfd, iov, in_num);  in rng_input()
3096 		iov_consume(vq->dev, iov, in_num, NULL, len);  in rng_input()