4.4BSD/usr/share/man/cat2/getdtablesize.0

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GETDTABLESIZE(2)            BSD Programmer's Manual           GETDTABLESIZE(2)

NNAAMMEE
     ggeettddttaabblleessiizzee - get descriptor table size

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>

     _i_n_t
     ggeettddttaabblleessiizzee(_v_o_i_d);

DDEESSCCRRIIPPTTIIOONN
     Each process has a fixed size descriptor table, which is guaranteed to
     have at least 20 slots.  The entries in the descriptor table are numbered
     with small integers starting at 0.  The call ggeettddttaabblleessiizzee() returns the
     size of this table.

SSEEEE AALLSSOO
     close(2),  dup(2),  open(2),  select(2)

HHIISSTTOORRYY
     The ggeettddttaabblleessiizzee function call appeared in 4.2BSD.

4.2 Berkeley Distribution        June 4, 1993                                1