Chuck Harris skrev: > M. Warner Losh wrote: >> In message: <[email protected]> >> James Cloos <[email protected]> writes: >> : >>>>> "Chuck" == Chuck Harris <[email protected]> writes: >> : >> : Chuck> The message implies that linux clocks counted: >> : >> : Chuck> 58..59..60..00..01 >> : >> : Chuck> Which would not be the POSIX way. >> : >> : No, the linux clocks counted: >> : >> : 1230768021..1230768022..1230768023..1230768024..1230768025 >> : >> : where 1230768024 is 2009-01-01 00:00:00 UTC. >> : >> : What gets output by any given userland apps depends on those apps. >> : >> : If one uses the Olsen tz database, the right zonefiles rather than the >> : posix zonefiles, and a libc such as glibc, then one will have seen the >> : seconds tick off 58..59..60..00..01. >> : >> : But that is purely a userland issue. >> : >> : If one uses the (lobotomized) posix zonefiles, one will have seen the >> : seconds tick off 21..22..23..24..25. >> : >> : (Interesting coincidence there, that 1970 through 2008 (inclusive) has a >> : number of days divisible by 5. Which makes for a nice, even 1230768000 >> : seconds, were there no leap seconds.) >> >> That doesn't match POSIX's mandated behavior... time_t % 86400 == 0 >> at midnight is an invariant that's violated by the above sequence. >> >> Warner > > Which is what my message was saying. If linux does count 58..59..60..0 > instead of 58..59..59..0, then it isn't following POSIX. [I have no > interest in getting into an argument over whether linux, or POSIX > should count that way.] > > Having a message from ntp.c that says there was a leap > to HH:MM:60 implies that HH:MM:60 is a valid time as far > as ntp.c's author is concerned.
It is valid UTC time, not valid POSIX time, which are two different things. > Having used unix since edition V, I am also aware of how unix > systems count off seconds since the epoch 1/1/1970. But that > really is immaterial to the discussion. No, since that is what POSIX says and Linux honours unless running NTP. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
