Open System Services Library Calls Reference Manual (H06.03+)

OSS Library Calls (i - m) logb(3)
RELATED INFORMATION
Functions: fp_class(3), ilogb(3), isnan(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, this function does not set errno to [EDOM] if the value of
x is NaN.
527187-003 Hewlett-Packard Company 4−83