On 12/10/2015 11:05 PM, Carlos O'Donell wrote: > When tzset is run the value of daylight is computed > by looking at all available rules for the application > of daylight savings. This includes reading the tzdata > files to determine if there is a transition or not for > the current timezone. It also includes parsing TZ env > to see if it specifies custom rules which are used in > precedence to any tzdata rules. Therefore daylight is > going to be set if there is a daylight saving rule past, > present, or future that indicates a transition. We clarify > that in the man page. > > Lastly, the note about tz_dsttime is not correct and is > removed. The earlier paragraph about daylight makes it > clear that it doesn't mean "daylight saving rule applies > now", and the interaction with tz_dsttime is not correct > for glibc on Linux (as outlined in my gettimeofday.3 patch > sent here: http://marc.info/?l=linux-man&m=144977768703615&w=2). Thanks, Carlos. Applied. Cheers, Michael > Signed-off-by: Carlos O'Donell <carlos@xxxxxxxxxx> > --- > Cheers, > Carlos. > > diff --git a/man3/tzset.3 b/man3/tzset.3 > index 545bd9c..4786dd9 100644 > --- a/man3/tzset.3 > +++ b/man3/tzset.3 > @@ -70,8 +70,8 @@ This function is automatically called by the > other time conversion functions that depend on the timezone. > In a System-V-like environment, it will also set the variables \fItimezone\fP > (seconds West of UTC) and \fIdaylight\fP (to 0 if this timezone does not > -have any daylight saving time rules, or to nonzero if there is a time during > -the year when daylight saving time applies). > +have any daylight saving time rules, or to nonzero if there is a time, > +past, present or future when daylight saving time applies). > .PP > If the > .B TZ > @@ -223,12 +223,6 @@ T} Thread safety MT-Safe env locale > .SH CONFORMING TO > POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD. > .SH NOTES > -Note that the variable \fIdaylight\fP does not indicate that daylight > -saving time applies right now. > -It used to give the number of some > -algorithm (see the variable \fItz_dsttime\fP in > -.BR gettimeofday (2)). > -It has been obsolete for many years but is required by SUSv2. > .LP > 4.3BSD had a function > .BI "char *timezone(" zone ", " dst ) > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
