-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Peter Steele wrote: >> Did you try unsetting TZ and then calling tzset()? The man page > implies that doing so will force a reread of /etc/localtime >> (http://www.freebsd.org/cgi/man.cgi?query=tzset&sourceid=opensearch): >> >> "The tzset() function initializes time conversion information used by > the library routine localtime(3). The environment variable TZ specifies > how this is done. >> If TZ does not appear in the environment, the best available > approximation to local wall clock time, as specified by the > tzfile(5)-format file /etc/localtime is used." >> I haven't tested it, though, and I'm no timezone expert, so I may be > completely off-base! > > Yes, I've tried the tzset function. I'm basically doing the equivalent > of these steps after the Java app changes time zone and updates > /etc/localtime: > > time_t date = time(NULL); > unsetenv("TZ"); > tzset(); > printf("time zone is %s/%s", tzname, tzname); > struct tm* locTime = localtime(&date); > printf("%02d:%02d:%02d", locTime->tm_hour, locTime->tm_min, > locTime->tm_sec); > > The time printed is still based on the old time zone though. The tzname > variable that is set by tzset() still shows for example EDT even if I > have just changed the time zone to PDT. If I stop and restart the C app, > the time is correct, and tzname is then PDT instead of EDT. > > I'm very puzzled on what I'm supposed to do to kick start the C time > zone. We do not want to have to restart our C apps for something as > trivial as this. >
Hi Peter, Ok, just wanted to make sure you tried unsetting TZ before calling tzset(). I couldn't tell from your original message. In any case, the man page makes it sound like it should work. I'm really rusty on C programming, but I had a look in /usr/src/lib/libc/stdtime/localtime.c, and it appears that /etc/localtime should be reloaded, although this comment at the beginning of tzload() gives me pause: /* XXX The following is from OpenBSD, and I'm not sure it is correct */ I wonder if you'd get more insight by asking the question in -hackers. Perhaps there are some libc experts listening there. Cheers, Greg - -- Greg Larkin http://www.FreeBSD.org/ - The Power To Serve http://www.sourcehosting.net/ - Ready. Set. Code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFKfH510sRouByUApARAjbKAJ9hjsl4X28JjVeZu/3RddR083/+ewCghkUY DF+xiTuRUKKnP1wlySTeMsc= =oZqF -----END PGP SIGNATURE----- _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"