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reference: simplify check for NaN

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Miroslav Lichvar 2017-08-18 17:24:41 +02:00
parent 5ab645e310
commit 8472fd8133
1 changed files with 2 additions and 20 deletions
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22
reference.c
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@ -931,28 +931,10 @@ REF_SetReference(int stratum,
return;
}
/* Guard against dividing by zero */
if (skew < MIN_SKEW)
/* Guard against dividing by zero and NaN */
if (!(skew > MIN_SKEW))
skew = MIN_SKEW;
/* If we get a serious rounding error in the source stats regression
processing, there is a remote chance that the skew argument is a
'not a number'. If such a quantity gets propagated into the
machine's kernel clock variables, nasty things will happen ..
To guard against this we need to check whether the skew argument
is a reasonable real number. I don't think isnan, isinf etc are
platform independent, so the following algorithm is used. */
{
double t;
t = (skew + skew) / skew; /* Skew shouldn't be zero either */
if ((t < 1.9) || (t > 2.1)) {
LOG(LOGS_WARN, "Bogus skew value encountered");
return;
}
}
LCL_ReadRawTime(&raw_now);
LCL_GetOffsetCorrection(&raw_now, &uncorrected_offset, NULL);
UTI_AddDoubleToTimespec(&raw_now, uncorrected_offset, &now);