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getdtablesize(3) [netbsd man page]

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 table 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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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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