SCATTER_SEGMENTS
struct iovec iov[SCATTER_SEGMENTS];
if (datalink2iov(NULL, iov, &niov, SCATTER_SEGMENTS, NULL, NULL) == -1) {
struct iovec iov[SCATTER_SEGMENTS];
if (datalink2iov(NULL, iov, &niov, SCATTER_SEGMENTS, NULL, NULL) == -1) {
struct iovec iov[SCATTER_SEGMENTS];
fd[0] = datalink2iov(dl, iov, &niov, SCATTER_SEGMENTS, fd + 2, &nfd);