1 /* $NetBSD: rpc_dtablesize.c,v 1.14 1998/11/15 17:32:43 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char *sccsid2 = "@(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro"; 33 static char *sccsid = "@(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC"; 34 #endif 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "namespace.h" 39 #include <unistd.h> 40 #include "un-namespace.h" 41 42 int _rpc_dtablesize(void); /* XXX */ 43 44 /* 45 * Cache the result of getdtablesize(), so we don't have to do an 46 * expensive system call every time. 47 */ 48 /* 49 * XXX In FreeBSD 2.x, you can have the maximum number of open file 50 * descriptors be greater than FD_SETSIZE (which us 256 by default). 51 * 52 * Since old programs tend to use this call to determine the first arg 53 * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)! 54 */ 55 int 56 _rpc_dtablesize(void) 57 { 58 static int size; 59 60 if (size == 0) { 61 size = getdtablesize(); 62 if (size > FD_SETSIZE) 63 size = FD_SETSIZE; 64 } 65 return (size); 66 } 67