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BSD 2.11 - man page for getdtablesize (bsd section 2)

GETDTABLESIZE(2)						System Calls Manual						  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 numbered 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)
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