BITMAPBITS
# define BITMAPBYTES (BITMAPBITS / BYTEBITS) /* number of bytes in bit map */
#if MAXQUEUEGROUPS >= BITMAPBITS
#define MAXFILESYS BITMAPBITS /* max # of queue file systems
* must be <= BITMAPBITS */
#if MAXMACROID != (BITMAPBITS - 1)
if (DtableSize > BITMAPBITS)
maxfd = BITMAPBITS;