fd_mask
sizeof(fd_mask));
sizeof(fd_mask));
sizeof(fd_mask));
sizeof(fd_mask) * 6];
ni = (db - fb) * sizeof(fd_mask); /* excess bytes */
ni = db * sizeof(fd_mask);
fd_mask *ibitp, *obitp;
ibitp = (fd_mask *)(bits + ni * 0);
obitp = (fd_mask *)(bits + ni * 3);
fd_mask ibits, obits;
fd_mask *fds = (fd_mask *)l->l_selbits;
fd_mask *ofds = (fd_mask *)((char *)fds + ni * 3);
fds = (fd_mask *)((char *)fds + ni);
ofds = (fd_mask *)((char *)ofds + ni);
fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);