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 * @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro 30 * @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC 31 * $NetBSD: rpc_dtablesize.c,v 1.14 1998/11/15 17:32:43 christos Exp $ 32 * $FreeBSD: src/lib/libc/rpc/rpc_dtablesize.c,v 1.15 2004/10/16 06:11:35 obrien Exp $ 33 * $DragonFly: src/lib/libc/rpc/rpc_dtablesize.c,v 1.3 2005/01/31 22:29:38 dillon Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <unistd.h> 38 #include "un-namespace.h" 39 40 int _rpc_dtablesize(void); /* XXX */ 41 42 /* 43 * Cache the result of getdtablesize(), so we don't have to do an 44 * expensive system call every time. 45 */ 46 /* 47 * XXX In FreeBSD 2.x, you can have the maximum number of open file 48 * descriptors be greater than FD_SETSIZE (which us 256 by default). 49 * 50 * Since old programs tend to use this call to determine the first arg 51 * for _select(), having this return > FD_SETSIZE is a Bad Idea(TM)! 52 */ 53 int 54 _rpc_dtablesize(void) 55 { 56 static int size; 57 58 if (size == 0) { 59 size = getdtablesize(); 60 if (size > FD_SETSIZE) 61 size = FD_SETSIZE; 62 } 63 return (size); 64 } 65