Linux Standard Base Core Specification 4.1 | ||
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__isnan() has the same specification as isnan() in POSIX 1003.1-2001 (ISO/IEC 9945-2003), except that the argument type for __isnan() is known to be double.
__isnan() is not in the source standard; it is only in the binary standard.
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__isinfl | Up | __isnanf |