rpc_dtablesize.c revision 92990 
1/*	$NetBSD: rpc_dtablesize.c,v 1.14 1998/11/15 17:32:43 christos Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char *sccsid = "@(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro";
34static char *sccsid = "@(#)rpc_dtablesize.c	2.1 88/07/29 4.0 RPCSRC";
35#endif
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/lib/libc/rpc/rpc_dtablesize.c 92990 2002-03-22 23:18:37Z obrien $");
38
39#include "namespace.h"
40#include <unistd.h>
41#include "un-namespace.h"
42
43int _rpc_dtablesize(void);	/* XXX */
44
45/*
46 * Cache the result of getdtablesize(), so we don't have to do an
47 * expensive system call every time.
48 */
49/*
50 * XXX In FreeBSD 2.x, you can have the maximum number of open file
51 * descriptors be greater than FD_SETSIZE (which us 256 by default).
52 *
53 * Since old programs tend to use this call to determine the first arg
54 * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)!
55 */
56int
57_rpc_dtablesize(void)
58{
59	static int size;
60
61	if (size == 0) {
62		size = getdtablesize();
63		if (size > FD_SETSIZE)
64			size = FD_SETSIZE;
65	}
66	return (size);
67}
68