Open System Services Library Calls Reference Manual (G06.28+, H06.05+)

OSS Library Calls (w - z) yn(3)
STANDARDS CONFORMANCE
The XPG4 Version 2 specification leaves some features to the implementing vendor to define.
The following features are affected in the HP implementation:
• For IEEE floating-point data, errno is not set to [EDOM] when the value of x is NaN.
527187-007 Hewlett-Packard Company 8−61