Date: Tue, 30 Oct 2001 11:21:39 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Bruce Evans <bde@zeta.org.au>, Nate Williams <nate@yogotech.com>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Peter Wemm <peter@wemm.org>, arch@FreeBSD.ORG Subject: Re: 64 bit times revisited.. Message-ID: <Pine.BSF.4.21.0110301120420.26174-100000@InterJet.elischer.org> In-Reply-To: <200110301834.f9UIYeR94440@apollo.backplane.com>
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On Tue, 30 Oct 2001, Matthew Dillon wrote:
> :On Mon, 29 Oct 2001, Julian Elischer wrote:
> :
> :> and you really want us to believe that data file came form 1910?
> :
> :I simply refuted a false claim that timestamps can't be before 1970.
> :
> :> On Tue, 30 Oct 2001, Bruce Evans wrote:
> :>
> :> > On Mon, 29 Oct 2001, Julian Elischer wrote:
> :> >
> :> > > be used for multiplying the seconds scale by 4. (in UFS timestamps..
> :> > > you would never write a non-normalised time to disk)
> :> > > also timestamps can't be before 1970 so making it unsigned
> :> > > allows us to go to 2100+ and mutiplying it by for takes us to about 2600..
> :> >
> :> > Script started on Tue Oct 30 06:55:55 2001
> :> > ttyp1:bde@gamplex:/tmp> touch -t 191001011230 foo
> :> > ttyp1:bde@gamplex:/tmp> ls -l foo
> :> > -rw-r--r-- 1 bde wheel 0 Jan 1 1910 foo
> :> > ttyp1:bde@gamplex:/tmp> exit
> :> >
> :> > Script done on Tue Oct 30 06:56:10 2001
> :
> :This mailing list is approaching the quality of the average newsgroup,
> :complete with top posting by newbies.
> :
> :Bruce
>
> We can't make time_t unsigned anyway. A huge amount of code
> (hundreds of instances) do delta comparisons and simply assume
> that time_t is signed. With it unsigned many of those comparisons
> would blow up (return true when they should return false).
I'm not advocating making time_t unsigned..
just the timestamp fields in the UFS inodes..
>
> I'm about ready to give up trying to convince people that it's worth
> moving IA32 to 64 bit timestamps. The bigger issue, however, is
> what to do about 64 bit platforms. I keep finding system calls
> that need to be rolled. The list is now getting pretty big. I am
> up to 22 system calls.
>
> This means that if we are NOT going to change IA32 but we ARE going
> to change 64 bit architectures, then we should do it *without*
> rolling system calls at all which would mean having to eat any
> binary incompatibilities from older code. It might conceivably be
> worth rolling the syscalls if we were to change IA32, but if we aren't
> it just isn't worth it to roll the syscalls just to support
> pre-time-change 64 bit platforms.
>
> -Matt
> Matthew Dillon
> <dillon@backplane.com>
>
>
> 7 MCOMPAT2 BSD { int wait4(int pid, int *status, int options, \
> 83 MCOMPAT2 BSD { int setitimer(u_int which, struct o2itimerval *itv, \
> 86 MCOMPAT2 BSD { int getitimer(u_int which, struct o2itimerval *itv); }
> 93 MCOMPAT2 BSD { int select(int nd, fd_set *in, fd_set *ou, \
> 116 MCOMPAT2 BSD { int gettimeofday(struct o2timeval *tp, \
> 117 MCOMPAT2 BSD { int getrusage(int who, struct o2rusage *rusage); }
> 122 MCOMPAT2 BSD { int settimeofday(struct o2timeval *tv, \
> 138 COMPAT2 BSD { int utimes(char *path, struct o2timeval *tptr); }
> 140 MCOMPAT2 BSD { int adjtime(struct o2timeval *delta, \
> 188 COMPAT2 POSIX { int stat(char *path, struct o2stat *ub); }
> 189 MCOMPAT2 POSIX { int fstat(int fd, struct o2stat *sb); }
> 190 COMPAT2 POSIX { int lstat(char *path, struct o2stat *ub); }
> 206 COMPAT2 BSD { int futimes(int fd, struct o2timeval *tptr); }
> 232 MCOMPAT2 POSIX { int clock_gettime(clockid_t clock_id, \
> 233 MCOMPAT2 POSIX { int clock_settime(clockid_t clock_id, \
> 234 MCOMPAT2 POSIX { int clock_getres(clockid_t clock_id, \
> 240 MCOMPAT2 POSIX { int nanosleep(const struct o2timespec *rqtp, \
> 276 COMPAT2 BSD { int lutimes(char *path, struct o2timeval *tptr); }
> 299 COMPAT2 BSD { int fhstat(const struct fhandle *u_fhp, struct o2stat *sb); }
> 315 COMPAT2 BSD { int aio_suspend(struct aiocb * const * aiocbp, int nent, const struct o2timespec *timeout); }
> 334 MCOMPAT2 POSIX { int sched_rr_get_interval (pid_t pid, struct o2timespec *interval); }
> 363 MCOMPAT2 BSD { int kevent(int fd, \
>
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