🚀 go-pugleaf

Ron House wrote:
> 
> Thanks to all the kind people who volunteered their suggestions to help
> me with this problem. I have now found the solution. It was Doug Moir
> who put me onto the right answer with this suggeestion:
> 
> >There is a bug in the program clock(8) (often found in /sbin)----- it
> >miscounts a timezone offset and confuses seconds with minutes or some
> >such.------- get a new version of the clock program.
> 
> I wanted to find out whether this was the problem. Luckily, Harald
> Hoffmann told me how to set and inquire about the kernel's internal
> variable, sys_tz:
> 
> >sys_tz can be set with settimeofday().
> 
> >Try this C program:
> 
> Harald's program didn't quite work, but the failure of the clock program
> to set sys_tz was indeed the cause, as gettimeofday() reported the
> timezone offset as 0.
> 
> I devised a program based on Harald's to apply a -10 hour correction (as
> Australia is east of Grenwich). Anyone with this problem west of there
> should apply a positive correction. Unfortunately I seem to have failed
> to copy the directory with the program, so I'll post it tomorrow.

I must be missing something.  How can /sbin/hwclock --show,
/sbin/hwclock --show --utc, date, date -u, and the perl gmtime and
localtime calls all do the right thing if the kernel doesn't know what
is going on?  (Note that /sbin/clock is a link to /sbin/hwclock.)

I took Harald's advice and RTM.  Herewith from the man page
  gettimeofday, settimeofday - get / set time

I am running RH5.1 2.0.34,  The man page is marked
`Linux 2.0.32 10 December 1997'

       struct timezone {
               int  tz_minuteswest; /* minutes W of Greenwich */
               int  tz_dsttime;     /* type of dst correction */
       };

       The use of the timezone struct is obsolete; the tz_dsttime
       field has never been used under Linux - it  has  not  been
       and  will  not  be  supported  by libc or glibc.  Each and
       every occurrence of this field in the kernel source (other
       than  the  declaration)  is  a bug. Thus, the following is
       purely of historic interest.

Now fair enough, the *field* tz_dsttime is completely unused, and is not
used in Harald's program.  But the man page claims that the `timezone
struct' is obsolete, not just tz_dsttime.  Caveat emptor.

Yours faithfully,
-- 
 __ /__   Peter B. West  p.west@uq.net.au
   /     http://www.uq.net.au/~zzpwest
  /     "Lord, to whom shall we go?"