BlackBox/_FreeBSD_/Lin/Mod/gen-Net/defs-fd_set-type

   1                 (* FreeBSD 11.0 /usr/include/sys/select.h *)
   2                         __fd_mask = SET;
   3                         fd_set* = ARRAY [untagged] (FD_SETSIZE + (_NFDBITS - 1)) DIV _NFDBITS OF __fd_mask;