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Linux 2.6 - man page for infnan (linux section 3)

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INFNAN(3)			    Linux Programmer's Manual				INFNAN(3)

NAME
       infnan - deal with infinite or not-a-number (NaN) result

SYNOPSIS
       #include <math.h>

       double infnan(int error);

       Link with -lm.

DESCRIPTION
       The  infnan()  function	returns  a  suitable  value for infinity and "not-a-number" (NaN)
       results.  The value of error can be ERANGE to represent infinity or anything else to  rep-
       resent NaN.  errno is also set.

RETURN VALUE
       If error is ERANGE (Infinity), HUGE_VAL is returned.

       If error is -ERANGE (-Infinity), -HUGE_VAL is returned.

       If error is anything else, NAN is returned.

ERRORS
       EDOM   The value of error is "not-a-number" (NaN).

       ERANGE The value of error is positive infinity or negative infinity.

CONFORMING TO
       4.3BSD.

NOTES
       This obsolete function was provided in libc4 and libc5, but is not available in glibc2.

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

GNU					    1993-06-02					INFNAN(3)
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