Date: Tue, 20 Nov 2001 01:36:14 +0100 From: Erik Trulsson <ertr1013@student.uu.se> To: John Baldwin <jhb@FreeBSD.org> Cc: hackers@FreeBSD.org Subject: Re: Ok, who broke timed? Message-ID: <20011120003613.GA29465@student.uu.se> In-Reply-To: <XFMail.011119150628.jhb@FreeBSD.org> References: <XFMail.011119150628.jhb@FreeBSD.org>
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On Mon, Nov 19, 2001 at 03:06:28PM -0800, John Baldwin wrote:
> Does timed have some major 64 bit issues or something? Trying to run timed on
> my 5.0 alpha from a 4.4 x86 box proves disastrous. 5.0 x86 clients work fine.
> The alpha keeps getting its date set back into 1970:
After quick look at the source I would say that timed has some major 64
bit issues.
As far as I can tell timed sends/receives a 'struct tsp' after
adjusting it for byteorder but not for wordsize. This struct is
defined in <protocols/timed.h> as
struct tsp {
u_char tsp_type;
u_char tsp_vers;
u_short tsp_seq;
union {
struct timeval tspu_time;
char tspu_hopcnt;
} tsp_u;
char tsp_name[MAXHOSTNAMELEN];
};
and struct timeval is defined in <sys/time.h> as
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* and microseconds */
};
Since 'long' is 32-bit on x86 and 64-bits on Alpha this means that
"interesting" things seem likely to happen if one tries to send a
'long' between machines when they don't agree on how large a 'long' is.
>
> Nov 19 14:06:02 baz timed[379]: slave to in.cx
> Jan 2 21:35:41 baz timed[379]: date changed by in.cx from Mon Nov 19 14:06:02
> 2001
> 19 Nov 14:07:49 ntpdate[533]: step time server 216.34.144.7 offset
> 1006002718.410080 sec
>
> (I ran ntpdate manually after killing timed.)
>
> On x86 the messages look like so:
>
> Nov 19 13:14:05 deimos timed[425]: slave to server.baldwin.cx
> Nov 19 13:13:42 deimos timed[425]: date changed by server.baldwin.cx from Mon
> Nov 19 13:14:05 2001
>
> And work fine. Also, FWIW, timed spits out a bunch of unaligned access
> warnings when it starts up on alpha.
--
<Insert your favourite quote here.>
Erik Trulsson
ertr1013@student.uu.se
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