Date: Mon, 25 Sep 2000 00:51:31 +0100 From: Mark Ovens <marko@freebsd.org> To: Joao Carlos Mendes Luis <jonny@jonny.eng.br> Cc: questions@freebsd.org Subject: Re: mktime(3) Y2K bug? Message-ID: <20000925005130.E255@parish> In-Reply-To: <39CE7C12.59AE80C5@jonny.eng.br>; from jonny@jonny.eng.br on Sun, Sep 24, 2000 at 07:11:30PM -0300 References: <39CD8FD9.F2B7419@jonny.eng.br> <20000924115101.A252@parish> <39CE7C12.59AE80C5@jonny.eng.br>
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On Sun, Sep 24, 2000 at 07:11:30PM -0300, Joao Carlos Mendes Luis wrote:
> What could this mean?
>
>
> krakatoa::root [629] ./a.out
> t = -1
> Wed Dec 31 20:59:59 1969
> krakatoa::root [630] TZ=EST3EDT ./a.out
> t = 970365660
> Sun Oct 1 00:01:00 2000
> krakatoa::root [631]
>
What version of FreeBSD? Also, what version of libc (time(3) is part of the
std C library)?
>
>
>
> Mark Ovens wrote:
> >
> > On Sun, Sep 24, 2000 at 02:23:37AM -0300, Joao Carlos Mendes Luis wrote:
> > > Hi,
> > >
> > > Try the following piece of code:
> > >
> > > #include <time.h>
> > >
> > > main()
> > > {
> > > struct tm tm;
> > > time_t t;
> > >
> > > bzero( &tm, sizeof tm );
> > > tm.tm_sec = 0;
> > > tm.tm_min = 1;
> > > tm.tm_hour = 0;
> > > tm.tm_mday = 1;
> > > tm.tm_mon = 9;
> > > tm.tm_year = 100;
> > > tm.tm_isdst = -1;
> > >
> > > t = mktime( &tm );
> > > printf( "t = %ld\n", t );
> > > printf( "%s", ctime( &t ) );
> > > }
> > >
> > >
> > > My results:
> > >
> > > FreeBSD:
> > >
> > > t = -1
> > > Wed Dec 31 20:59:59 1969
> > >
> >
> > Hmm, what version of FreeBSD? It works OK for me on 4.1-STABLE:
> >
> > /usr/marko{52}% cat > foo.c
> > #include <time.h>
> >
> > main()
> > {
> > struct tm tm;
> > time_t t;
> >
> > bzero( &tm, sizeof tm );
> > tm.tm_sec = 0;
> > tm.tm_min = 1;
> > tm.tm_hour = 0;
> > tm.tm_mday = 1;
> > tm.tm_mon = 9;
> > tm.tm_year = 100;
> > tm.tm_isdst = -1;
> >
> > t = mktime( &tm );
> > printf( "t = %ld\n", t );
> > printf( "%s", ctime( &t ) );
> > }
> > /usr/marko{53}% cc -o foo foo.c
> > /usr/marko{54}% ./foo
> > t = 970354860
> > Sun Oct 1 00:01:00 2000
> > /usr/marko{55}%
> >
> > > Solaris:
> > >
> > > t = 970369260
> > > Sun Oct 1 00:01:00 2000
> > >
> > > Linux:
> > >
> > > t = -1
> > > Wed Dec 31 20:59:59 1969
> > >
> > > If I change tm_year to 99, everything is ok.
> > >
> > > Is this a bug, or just something stupid I can´t see at 2am without
> > > enough coffe?
> > >
> > > I found this executing at(1) as "at 10/01/00", if that matters.
> > >
> > > TIA,
> > >
> > > Jonny
> > >
> > > --
> > > João Carlos Mendes Luís jonny@embratel.net.br
> > > Networking Engineer jonny@jonny.eng.br
> > > Internet via Embratel jcml@ieee.org
> > >
> > >
> > > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > > with "unsubscribe freebsd-questions" in the body of the message
> >
> > --
> > 4.4 - The number of the Beastie
> > ________________________________________________________________
> > 51.44°N FreeBSD - The Power To Serve http://www.freebsd.org
> > 2.057°W My Webpage http://ukug.uk.freebsd.org/~mark
> > mailto:marko@freebsd.org http://www.radan.com
>
> --
>
> Jonny
>
> --
> João Carlos Mendes Luís jonny@embratel.net.br
> Networking Engineer jonny@jonny.eng.br
> Internet via Embratel jcml@ieee.org
--
4.4 - The number of the Beastie
________________________________________________________________
51.44°N FreeBSD - The Power To Serve http://www.freebsd.org
2.057°W My Webpage http://ukug.uk.freebsd.org/~mark
mailto:marko@freebsd.org http://www.radan.com
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