getdtablesize man page on NetBSD

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GETDTABLESIZE(3)	 BSD Library Functions Manual	      GETDTABLESIZE(3)

NAME
     getdtablesize — get descriptor table size

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     getdtablesize(void);

DESCRIPTION
     The getdtablesize function is an equivalent of sysconf() with
     _SC_OPEN_MAX.

SEE ALSO
     close(2), dup(2), getrlimit(2), open(2), select(2), sysconf(3)

HISTORY
     The getdtablesize() function call appeared in 4.2BSD.

     Historically, each process had a fixed size descriptor table, which is
     guaranteed to have at least 20 slots.  The entries in the descriptor ta‐
     ble are numbered with small integers starting at 0.  The call
     getdtablesize() used to return the size of this table.  It doesn't make
     much sense these days because the size of the table is dynamic.

BSD				January 5, 2012				   BSD
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