dumb question

[Thomas Bushnell, n/BSG]

   Date: Tue, 30 Jun 1998 12:59:32 -0400
   From: Roland McGrath <roland@frob.com>

   > The advantage of using poll instead of select is that glibc is not
   > dependend anymore on FD_SETSIZE and doesn't need to be recompiled if
   > the user changes NR_OPEN.

   The select interface was designed specifically to avoid this problem,
   if you use it right.  You should never need to use FD_SETSIZE.  You can
   dynamically allocate as many bits as you need, and then you pass the max fd
   number to select.  If the kernel is not a piece of shit, this works fine.

This is true for the select call itself, but not the associated macros
for defining file descriptor sets.