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author | wollman <wollman@FreeBSD.org> | 1994-09-13 21:26:08 +0000 |
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committer | wollman <wollman@FreeBSD.org> | 1994-09-13 21:26:08 +0000 |
commit | 7fa1ec8f19cfa0f61f5837484beb3ae048b27a36 (patch) | |
tree | 59aafe236f02fdbccdbd9f64cd4f39014faa2fb0 /lib/libc/stdtime/tzfile.5 | |
parent | a22611d1cc1109e8a5f85ddce83de800d10dcea8 (diff) | |
download | FreeBSD-src-7fa1ec8f19cfa0f61f5837484beb3ae048b27a36.zip FreeBSD-src-7fa1ec8f19cfa0f61f5837484beb3ae048b27a36.tar.gz |
Use latest Arthur Olson timezone code rather than that supplied with
4.4. The code is almost identical to the 4.4 versions, but this organization
should make it easier to merge new versions in the future.
Diffstat (limited to 'lib/libc/stdtime/tzfile.5')
-rw-r--r-- | lib/libc/stdtime/tzfile.5 | 117 |
1 files changed, 58 insertions, 59 deletions
diff --git a/lib/libc/stdtime/tzfile.5 b/lib/libc/stdtime/tzfile.5 index 1d47033..4bff7de 100644 --- a/lib/libc/stdtime/tzfile.5 +++ b/lib/libc/stdtime/tzfile.5 @@ -1,123 +1,122 @@ -.TH TZFILE 5 -.SH NAME -tzfile \- time zone information -.SH SYNOPSIS -.B -#include <tzfile.h> -.SH DESCRIPTION +.Dd September 13, 1994 +.Dt TZFILE 5 +.Os FreeBSD 2.0 +.Sh NAME +.Nm tzfile +.Nd time zone information +.Sh SYNOPSIS +.Fd #include <tzfile.h> +.Sh DESCRIPTION The time zone information files used by -.IR tzset (3) +.Xr tzset 3 begin with bytes reserved for future use, followed by four four-byte values of type -.BR long , +.Fa long , written in a ``standard'' byte order (the high-order byte of the value is written first). These values are, in order: -.TP -.I tzh_ttisstdcnt +.Pp +.Bl -tag -compact -width tzh_ttisstdcnt +.It Li tzh_ttisstdcnt The number of standard/wall indicators stored in the file. -.TP -.I tzh_leapcnt +.It Li tzh_leapcnt The number of leap seconds for which data is stored in the file. -.TP -.I tzh_timecnt -The number of "transition times" for which data is stored +.It Li tzh_timecnt +The number of ``transition times'' for which data is stored in the file. -.TP -.I tzh_typecnt -The number of "local time types" for which data is stored +.It Li tzh_typecnt +The number of ``local time types'' for which data is stored in the file (must not be zero). -.TP -.I tzh_charcnt -The number of characters of "time zone abbreviation strings" +.It Li tzh_charcnt +The number of characters of ``time zone abbreviation strings'' stored in the file. -.PP +.El +.Pp The above header is followed by -.I tzh_timecnt +.Li tzh_timecnt four-byte values of type -.BR long , +.Fa long , sorted in ascending order. These values are written in ``standard'' byte order. Each is used as a transition time (as returned by -.IR time (2)) +.Xr time 2 ) at which the rules for computing local time change. Next come -.I tzh_timecnt +.Li tzh_timecnt one-byte values of type -.BR "unsigned char" ; +.Fa "unsigned char" ; each one tells which of the different types of ``local time'' types described in the file is associated with the same-indexed transition time. These values serve as indices into an array of -.I ttinfo +.Fa ttinfo structures that appears next in the file; these structures are defined as follows: -.in +.5i -.sp -.nf -.ta .5i +\w'unsigned int\0\0'u +.Pp +.Bd -literal -offset indent struct ttinfo { long tt_gmtoff; int tt_isdst; unsigned int tt_abbrind; }; -.in -.5i -.fi -.sp +.Ed +.Pp Each structure is written as a four-byte value for -.I tt_gmtoff +.Li tt_gmtoff of type -.BR long , +.Fa long , in a standard byte order, followed by a one-byte value for -.I tt_isdst +.Li tt_isdst and a one-byte value for -.IR tt_abbrind . +.Li tt_abbrind . In each structure, -.I tt_gmtoff +.Li tt_gmtoff gives the number of seconds to be added to GMT, -.I tt_isdst +.Li tt_isdst tells whether -.I tm_isdst +.Li tm_isdst should be set by -.I localtime (3) +.Xr localtime 3 and -.I tt_abbrind +.Li tt_abbrind serves as an index into the array of time zone abbreviation characters that follow the -.I ttinfo +.Li ttinfo structure(s) in the file. -.PP +.Pp Then there are -.I tzh_leapcnt +.Li tzh_leapcnt pairs of four-byte values, written in standard byte order; the first value of each pair gives the time (as returned by -.IR time(2)) +.Xr time 2 ) at which a leap second occurs; the second gives the -.I total +.Em total number of leap seconds to be applied after the given time. The pairs of values are sorted in ascending order by time. -.PP +.Pp Finally there are -.I tzh_ttisstdcnt +.Li tzh_ttisstdcnt standard/wall indicators, each stored as a one-byte value; they tell whether the transition times associated with local time types were specified as standard time or wall clock time, and are used when a time zone file is used in handling POSIX-style time zone environment variables. -.PP -.I Localtime +.Pp +.Nm localtime uses the first standard-time -.I ttinfo +.Li ttinfo structure in the file (or simply the first -.I ttinfo +.Li ttinfo structure in the absence of a standard-time structure) if either -.I tzh_timecnt +.Li tzh_timecnt is zero or the time argument is less than the first transition time recorded in the file. -.SH SEE ALSO -newctime(3) +.Sh SEE ALSO +.Xr ctime 3 , +.Xr time2posix 3 , +.Xr zic 8 .\" @(#)tzfile.5 7.2 |