IOV_SIZE
struct iovec iov[IOV_SIZE];
if (writev(f->f_file, iov, IOV_SIZE) < 0) {
if (writev(f->f_file, iov, IOV_SIZE) < 0) {
if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
wallmsg(f, iov, IOV_SIZE);