1 /*- 2 * Copyright (c) 2009, Sun Microsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 * @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro 29 * @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC 30 * $NetBSD: rpc_dtablesize.c,v 1.14 1998/11/15 17:32:43 christos Exp $ 31 * $FreeBSD: src/lib/libc/rpc/rpc_dtablesize.c,v 1.15 2004/10/16 06:11:35 obrien Exp $ 32 * $DragonFly: src/lib/libc/rpc/rpc_dtablesize.c,v 1.3 2005/01/31 22:29:38 dillon Exp $ 33 */ 34 35 #include "namespace.h" 36 #include <unistd.h> 37 #include "un-namespace.h" 38 39 int _rpc_dtablesize(void); /* XXX */ 40 41 /* 42 * Cache the result of getdtablesize(), so we don't have to do an 43 * expensive system call every time. 44 */ 45 /* 46 * XXX In FreeBSD 2.x, you can have the maximum number of open file 47 * descriptors be greater than FD_SETSIZE (which us 256 by default). 48 * 49 * Since old programs tend to use this call to determine the first arg 50 * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)! 51 */ 52 int 53 _rpc_dtablesize(void) 54 { 55 static int size; 56 57 if (size == 0) { 58 size = getdtablesize(); 59 if (size > FD_SETSIZE) 60 size = FD_SETSIZE; 61 } 62 return (size); 63 } 64