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) March 1, 1996 GETDTABLESIZE(3C)
