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skrzyp |
//==========================================================================
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//
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// src/magic.c
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 2003 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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// ####BSDALTCOPYRIGHTBEGIN####
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// -------------------------------------------
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// Portions of this software may have been derived from FreeBSD, OpenBSD,
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// or other sources, and if so are covered by the appropriate copyright
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// and license included herein.
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// -------------------------------------------
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// ####BSDALTCOPYRIGHTEND####
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//==========================================================================
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/*
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* magic.c - PPP Magic Number routines.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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//static char rcsid[] = "$FreeBSD: src/usr.sbin/pppd/magic.c,v 1.8 1999/08/28 01:19:05 peter Exp $";
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "cyg/ppp/pppd.h"
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#include "cyg/ppp/magic.h"
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extern long mrand48 __P((void));
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extern void srand48 __P((long));
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/*
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* magic_init - Initialize the magic number generator.
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*
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* Attempts to compute a random number seed which will not repeat.
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* The current method uses the current hostid, current process ID
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* and current time, currently.
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*/
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void
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magic_init()
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{
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long seed;
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struct timeval t;
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gettimeofday(&t, NULL);
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#ifndef __ECOS
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seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid();
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#else
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seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ 42;
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#endif
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srand48(seed);
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}
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/*
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* magic - Returns the next magic number.
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*/
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u_int32_t
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magic()
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{
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return (u_int32_t) mrand48();
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}
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#ifdef NO_DRAND48
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/*
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* Substitute procedures for those systems which don't have
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* drand48 et al.
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*/
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double
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drand48()
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{
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return (double)random() / (double)0x7fffffffL; /* 2**31-1 */
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}
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long
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mrand48()
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{
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return random();
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}
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void
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srand48(seedval)
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long seedval;
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{
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srandom((int)seedval);
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}
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#endif
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