fd_mask
bytes = howmany(sock + 128, NFDBITS) * sizeof(fd_mask);
howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask));
__svc_fdsetsize = bytes / sizeof(fd_mask) * NFDBITS;
fd_mask mask, *maskp;
n_events = (fdsz/sizeof(fd_mask)) * NFDBITS;
n_events_old = (sop->event_fdsz/sizeof(fd_mask)) * NFDBITS;
if (fdsz < sizeof(fd_mask))
fdsz = sizeof(fd_mask);
(howmany(ev->ev_fd + 1, NFDBITS) * sizeof(fd_mask)))
select_resize(sop, howmany(32 + 1, NFDBITS)*sizeof(fd_mask));
rfds = calloc(howmany(maxfd + 1, NFDBITS), sizeof(fd_mask));
wfds = calloc(howmany(maxfd + 1, NFDBITS), sizeof(fd_mask));
fdset = calloc(fdlen, sizeof(fd_mask));
mask_size = howmany(n, NFDBITS) * sizeof(fd_mask);
fd_mask bits[6];
ni = howmany(nd, NFDBITS) * sizeof(fd_mask);
fd_mask bits;
rchildfdsp = xcalloc(howmany(rchildfdsn+1, NFDBITS), sizeof(fd_mask));
fdsn = howmany(max_fds+1, NFDBITS) * sizeof(fd_mask);
bytes = howmany(fdsn, NFDBITS) * sizeof(fd_mask);
bytes = howmany(fdsn, NFDBITS) * sizeof(fd_mask);
fdsn = howmany(ttyfd+1, NFDBITS) * sizeof(fd_mask);
fdsn = howmany(loop_master+1, NFDBITS) * sizeof(fd_mask);
fdsetsize = howmany(n, NFDBITS) * sizeof(fd_mask);