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leapdb: support leap-seconds.list as second source

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The existing implementation of getting leap second information from a
timezone in get_tz_leap() relies on non-portable C library behaviour.

Specifically, mktime is not required to return '60' in the tm_sec field
when a leap second is inserted leading to "Timezone right/UTC failed
leap second check, ignoring" errors on musl based systems.

This patch adds support for getting leap second information from the
leap-seconds.list file included with tzdata and adds a new configuration
directive leapseclist to switch on the feature.
This commit is contained in:
Patrick Oppenlander
2024-02-08 14:36:28 +11:00
committed by Miroslav Lichvar
parent 83f90279b0
commit 53823b9f1c
5 changed files with 155 additions and 10 deletions
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conf.h
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@@ -91,6 +91,7 @@ extern char *CNF_GetNtpSigndSocket(void);
extern char *CNF_GetPidFile(void);
extern REF_LeapMode CNF_GetLeapSecMode(void);
extern char *CNF_GetLeapSecTimezone(void);
extern char *CNF_GetLeapSecList(void);
/* Value returned in ppm, as read from file */
extern double CNF_GetMaxUpdateSkew(void);