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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [pppd/] [magic.c] - Blame information for rev 30

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1 30 unneback
/*
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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[] = "$Id: magic.c,v 1.2 2001-09-27 12:01:57 chris 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 <stdlib.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "pppd.h"
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#include "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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    seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid();
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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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/*
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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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/* #include <stdlib.h> */
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double
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drand48()
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{
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    return (double)rand() / (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 rand();
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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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    srand((int)seedval);
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}
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