Re: TZ and MINT

[jerry@jerry.dialup.fu-berlin.de (Jerry Geiger)]

Hi Andreas Schwab, Jens M Felderhoff

Last year I posted here a diff archive for POSIX time (esp. TZ rules) in
mintlib, to patch libsrc PL46.

Further I made some proposals for a gettimeofday funtion and TOS
compatible time handling in MiNT, but no one seemed interested.
So my MiNT system is running with UTC time now, therefore I also patched the
time() function from mintlib (replacing the mktime() call with the _unixtim()
function from MiNT sources).
Of course this works only on machines running the clock with UTC time. And
of course you have to recompile all programs using local time (date, ls,
mailers, etc).
To make it portable at least I suggest a clock cookie:
'CLOC' 'clock_cookie_value' where the upper 8 bits in clock_cookie_value
are a bitfield:
if == 0 or doesn't exist: clock is (Tgettime/date returns) local time + DST
according TZ environment variable
	00000001	clock is UTC time
	00000010	Tgettimeofday() function and unxitime variable
			available, returns (only) timeval struct
	00000110	Tgettimeofday() function returns also timezone

Tgettimeofday() of course returns always UTC time in seconds since 1970

If this cookie doesn't exist when MiNT starts up it creates it according to its
time capabilities, if it exists MiNT changes it accordingly.

--
  jerry
        jerry@merlin.abacus.de          jerry@zedat.fu-berlin.de