1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro";*/ 32 /*static char *sccsid = "from: @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC";*/ 33 static char *rcsid = "rpc_dtablesize.c,v 1.1 1994/08/07 18:36:02 wollman Exp"; 34 #endif 35 36 #include <sys/types.h> 37 38 /* 39 * Cache the result of getdtablesize(), so we don't have to do an 40 * expensive system call every time. 41 */ 42 /* 43 * XXX In FreeBSD 2.x, you can have the maximum number of open file 44 * descriptors be greater than FD_SETSIZE (which us 256 by default). 45 * This can lead to many RPC functions getting back an EINVAL from 46 * select() and bombing all over the place. 47 * 48 * You can apparently get select() to handle values larger than 256 49 * by patching the kernel, but most people aren't likely to know 50 * that. Clamping this function at 256 is a kludge, but it'll have to 51 * do until select()'s descriptor table size can be adjusted dynamically. 52 */ 53 _rpc_dtablesize() 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