4.3BSD - /usr/man/cat2/getdtablesize.0

GETDTABLESIZE(2)                                              GETDTABLESIZE(2)


NAME
       getdtablesize - get descriptor table size

SYNOPSIS
       nfds = getdtablesize()
       int nfds;

DESCRIPTION
       Each  process has a fixed size descriptor table, which is guaranteed to
       have at least 20 slots.  The entries in the descriptor table  are  num‐
       bered  with  small  integers  starting  at  0.   The call getdtablesize
       returns the size of this table.

SEE ALSO
       close(2), dup(2), open(2), select(2)


4.2 Berkeley Distribution        June 28, 1985                GETDTABLESIZE(2)