rpc_dtablesize.c revision 7616
1232922Stheraven/* 2232922Stheraven * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3232922Stheraven * unrestricted use provided that this legend is included on all tape 4232922Stheraven * media and as a part of the software program in whole or part. Users 5232922Stheraven * may copy or modify Sun RPC without charge, but are not authorized 6232922Stheraven * to license or distribute it to anyone else except as part of a product or 7232922Stheraven * program developed by the user. 8232922Stheraven * 9232922Stheraven * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10232922Stheraven * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11232922Stheraven * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12232922Stheraven * 13232922Stheraven * Sun RPC is provided with no support and without any obligation on the 14232922Stheraven * part of Sun Microsystems, Inc. to assist in its use, correction, 15232922Stheraven * modification or enhancement. 16232922Stheraven * 17232922Stheraven * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18232922Stheraven * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19232922Stheraven * OR ANY PART THEREOF. 20232922Stheraven * 21232922Stheraven * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22232922Stheraven * or profits or other special, indirect and consequential damages, even if 23232922Stheraven * Sun has been advised of the possibility of such damages. 24232922Stheraven * 25232922Stheraven * Sun Microsystems, Inc. 26232922Stheraven * 2550 Garcia Avenue 27227825Stheraven * Mountain View, California 94043 28227825Stheraven */ 29227825Stheraven 30227825Stheraven#if defined(LIBC_SCCS) && !defined(lint) 31227825Stheraven/*static char *sccsid = "from: @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro";*/ 32227825Stheraven/*static char *sccsid = "from: @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC";*/ 33227825Stheravenstatic char *rcsid = "rpc_dtablesize.c,v 1.1 1994/08/07 18:36:02 wollman Exp"; 34227825Stheraven#endif 35227825Stheraven 36227825Stheraven#include <sys/types.h> 37227825Stheraven 38227825Stheraven/* 39227825Stheraven * Cache the result of getdtablesize(), so we don't have to do an 40227825Stheraven * expensive system call every time. 41227825Stheraven */ 42227825Stheraven/* 43227825Stheraven * XXX In FreeBSD 2.x, you can have the maximum number of open file 44227825Stheraven * descriptors be greater than FD_SETSIZE (which us 256 by default). 45227825Stheraven * This can lead to many RPC functions getting back an EINVAL from 46227825Stheraven * select() and bombing all over the place. 47227825Stheraven * 48227825Stheraven * You can apparently get select() to handle values larger than 256 49227825Stheraven * by patching the kernel, but most people aren't likely to know 50227825Stheraven * that. Clamping this function at 256 is a kludge, but it'll have to 51227825Stheraven * do until select()'s descriptor table size can be adjusted dynamically. 52227825Stheraven */ 53227825Stheraven_rpc_dtablesize() 54227825Stheraven{ 55227825Stheraven static int size; 56227825Stheraven 57227825Stheraven if (size == 0) { 58227825Stheraven size = getdtablesize(); 59227825Stheraven if (size > FD_SETSIZE) 60227825Stheraven size = FD_SETSIZE; 61227825Stheraven } 62227825Stheraven return (size); 63227825Stheraven} 64227825Stheraven