rn_readfd
if (rn->rn_readfd != -1)
RUMPUSER_OPEN_RDONLY, &rn->rn_readfd);
if ((error = rumpuser_iovread(rn->rn_readfd, &iov, 1,
if (rn->rn_readfd != -1) {
rumpuser_close(rn->rn_readfd);
rn->rn_readfd = -1;
rn->rn_readfd = -1;