1 /* @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC */ 2 /* 3 * Copyright (c) 2010, Oracle America, Inc. 4 * 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 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * * Neither the name of the "Oracle America, Inc." nor the names of 19 * its contributors may be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 23 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #if !defined(lint) && defined(SCCSIDS) 35 static char sccsid[] = "@(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro"; 36 #endif 37 38 #include <unistd.h> 39 #include <gssrpc/rpc.h> 40 41 /* 42 * Cache the result of getdtablesize(), so we don't have to do an 43 * expensive system call every time. 44 */ 45 int 46 gssrpc__rpc_dtablesize(void) 47 { 48 static int size; 49 50 if (size == 0) { 51 #ifdef _SC_OPEN_MAX 52 size = (int) sysconf(_SC_OPEN_MAX); 53 #else 54 size = getdtablesize(); 55 #endif 56 57 /* sysconf() can return a number larger than what will fit in an 58 fd_set. we can't use fd's larger than this, anyway. */ 59 60 #ifdef FD_SETSIZE 61 if (size >= FD_SETSIZE) 62 size = FD_SETSIZE-1; 63 #endif 64 } 65 return (size); 66 } 67