271 static bool iov_empty(const struct iovec iov[], unsigned int num_iov)  in iov_empty()  argument
276 		if (iov[i].iov_len)  in iov_empty()
283 			struct iovec iov[], unsigned num_iov,  in iov_consume()  argument
291 		used = iov[i].iov_len < len ? iov[i].iov_len : len;  in iov_consume()
293 			memcpy(dest, iov[i].iov_base, used);  in iov_consume()
296 		iov[i].iov_base += used;  in iov_consume()
297 		iov[i].iov_len -= used;  in iov_consume()
741 				 struct iovec iov[],  in wait_for_vq_desc()  argument
886 		iov[*out_num + *in_num].iov_len = desc[i].len;  in wait_for_vq_desc()
887 		iov[*out_num + *in_num].iov_base  in wait_for_vq_desc()
958 	struct iovec iov[vq->vring.num];  in console_input()  local
961 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in console_input()
966 	len = readv(STDIN_FILENO, iov, in_num);  in console_input()
989 	if (len != 1 || ((char *)iov[0].iov_base)[0] != 3) {  in console_input()
1011 	struct iovec iov[vq->vring.num];  in console_output()  local
1014 	head = wait_for_vq_desc(vq, iov, &out, &in);  in console_output()
1019 	while (!iov_empty(iov, out)) {  in console_output()
1020 		int len = writev(STDOUT_FILENO, iov, out);  in console_output()
1025 		iov_consume(vq->dev, iov, out, NULL, len);  in console_output()
1049 	struct iovec iov[vq->vring.num];  in net_output()  local
1052 	head = wait_for_vq_desc(vq, iov, &out, &in);  in net_output()
1059 	if (writev(net_info->tunfd, iov, out) < 0)  in net_output()
1093 	struct iovec iov[vq->vring.num];  in net_input()  local
1100 	head = wait_for_vq_desc(vq, iov, &out, &in);  in net_input()
1115 	len = readv(net_info->tunfd, iov, in);  in net_input()
2945 	struct iovec iov[vq->vring.num];  in blk_request()  local
2952 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in blk_request()
2955 	iov_consume(vq->dev, iov, out_num, &out, sizeof(out));  in blk_request()
2960 		if (iov[i].iov_len > 0) {  in blk_request()
2961 			in = iov[i].iov_base + iov[i].iov_len - 1;  in blk_request()
2962 			iov[i].iov_len--;  in blk_request()
2985 		ret = writev(vblk->fd, iov, out_num);  in blk_request()
3018 		ret = readv(vblk->fd, iov + out_num, in_num);  in blk_request()
3085 	struct iovec iov[vq->vring.num];  in rng_input()  local
3088 	head = wait_for_vq_desc(vq, iov, &out_num, &in_num);  in rng_input()
3096 	while (!iov_empty(iov, in_num)) {  in rng_input()
3097 		len = readv(rng_info->rfd, iov, in_num);  in rng_input()
3100 		iov_consume(vq->dev, iov, in_num, NULL, len);  in rng_input()