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Copyright (c) 1983 Regents of the University of California. All rights reserved. The Berkeley software License Agreement specifies the terms and conditions for redistribution.
Copyright (c) 1996, Sun Microsystems, Inc. All Rights Reserved Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved
Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
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This notice shall appear on any product containing this material.
Copyright (c) 1983 Regents of the University of California. All rights reserved. The Berkeley software License Agreement specifies the terms and conditions for redistribution.
Copyright (c) 1996, Sun Microsystems, Inc. All Rights Reserved Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved
Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
http://www.opengroup.org/bookstore/.
The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
This notice shall appear on any product containing this material.
getdtablesize 3C "1 Mar 1996" "SunOS 5.11" "Standard C Library Functions"
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)