On 01/29/2015 05:31 PM, J William Piggott wrote:
> Based upon reviewing the glibc source, the posixrules file is being used
> for very specific TZ strings that can be represented as:
>
> [:]stdoffsetdst[offset][,]
>
> If anything follows the above string, even invalid data, posixrules will
> not be used. Below is some shell output demonstrating this.
>
> $ TZ="NZST-12:00:00NZDT-13:00:00,ANYTHING" \
> strace -eopen date 2>&1 | grep -Ei 'posixrules|jan'
> Thu Jan 29 06:53:35 NZDT 2015
>
> $ TZ="NZST-12:00:00NZDT-13:00:00," \
> strace -eopen date 2>&1 | grep -Ei 'posixrules|jan'
> open("/usr/share/zoneinfo/posixrules", O_RDONLY|O_CLOEXEC) = 3
> Thu Jan 29 05:54:58 NZST 2015
Thanks, William. Applied.
Cheers,
Michael
> Signed-off-by: J William Piggott <elseifthen@xxxxxxx>
> ---
> man3/tzset.3 | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/man3/tzset.3 b/man3/tzset.3
> index a9b088d..9cb9d32 100644
> --- a/man3/tzset.3
> +++ b/man3/tzset.3
> @@ -200,6 +200,12 @@ The system timezone file.
> The system timezone database directory.
> .TP
> .B /usr/share/zoneinfo/posixrules
> +When a TZ string includes a dst timezone without anything following it,
> +then this file is used for the start/end rules.
> +It is in the
> +.BR tzfile "(5) format."
> +By default, the zoneinfo Makefile hard links it to the
> +.IR America/New_York " tzfile."
> .PP
> Above are the current standard file locations, but they are
> configurable when glibc is compiled.
>
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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