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| -rw-r--r-- | man3/fpclassify.3 | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/man3/fpclassify.3 b/man3/fpclassify.3 index 9eb4dc568e..5a533cf649 100644 --- a/man3/fpclassify.3 +++ b/man3/fpclassify.3 @@ -67,12 +67,18 @@ returns a non-zero value if (fpclassify(x) == FP_NAN) .TP .BI isinf( x ) -returns a non-zero value if -(fpclassify(x) == FP_INFINITE) +returns 1 if +.I x +is positive infinity, and \-1 if +.I x +is negative infinity. .SH NOTE -On systems conforming to BSD 4.3, +In glibc 2.01 and earlier, .B isinf() -will return 1 for positive, and \-1 for negative infinity. +returns a non-zero value (actually: 1) if +.I x +is an infinity (positive or negative). +(This is all that C99 requires.) .SH "CONFORMING TO" C99 .SH "SEE ALSO" |