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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [pppd/] [magic.c] - Rev 173
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/* * magic.c - PPP Magic Number routines. * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint /* static char rcsid[] = "$Id: magic.c,v 1.2 2001-09-27 12:01:57 chris Exp $"; */ #endif #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/time.h> #include "pppd.h" #include "magic.h" extern long mrand48 __P((void)); extern void srand48 __P((long)); /* * magic_init - Initialize the magic number generator. * * Attempts to compute a random number seed which will not repeat. * The current method uses the current hostid, current process ID * and current time, currently. */ void magic_init() { long seed; struct timeval t; gettimeofday(&t, NULL); seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid(); srand48(seed); } /* * magic - Returns the next magic number. */ u_int32_t magic() { return (u_int32_t) mrand48(); } /* * Substitute procedures for those systems which don't have * drand48 et al. */ /* #include <stdlib.h> */ double drand48() { return (double)rand() / (double)0x7fffffffL; /* 2**31-1 */ } long mrand48() { return rand(); } void srand48(seedval) long seedval; { srand((int)seedval); }