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    Fix syslogger to not fail when log_rotation_age exceeds 2^31 milliseconds.
    Tom Lane authored 
    We need to avoid calling WaitLatch with timeouts exceeding INT_MAX.
Fortunately a simple clamp will do the trick, since no harm is done if
the wait times out before it's really time to rotate the log file.
Per bug #7670 (probably bug #7545 is the same thing, too).

In passing, fix bogus definition of log_rotation_age's maximum value in
guc.c --- it was numerically right, but only because MINS_PER_HOUR and
SECS_PER_MINUTE have the same value.

Back-patch to 9.2.  Before that, syslogger wasn't using WaitLatch.
    d038966d
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