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OpenSolaris 2009.06 - man page for getdtablesize (opensolaris section 3c)

getdtablesize(3C)					   Standard C Library Functions 					 getdtablesize(3C)

NAME
getdtablesize - get the file descriptor table size
SYNOPSIS
#include <unistd.h> int getdtablesize(void);
DESCRIPTION
The getdtablesize() function is equivalent to getrlimit(2) with the RLIMIT_NOFILE option.
RETURN VALUES
The getdtablesize() function returns the current soft limit as if obtained from a call to getrlimit() with the RLIMIT_NOFILE option.
ERRORS
No errors are defined.
USAGE
There is no direct relationship between the value returned by getdtablesize() and OPEN_MAX defined in <limits.h>. Each process has a file 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 getdtablesize() function returns the current maximum size of this table by calling the getrlimit() function.
SEE ALSO
close(2), getrlimit(2), open(2), setrlimit(2), select(3C) SunOS 5.11 1 Mar 1996 getdtablesize(3C)

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