Remove numerous references to VAX floating-point and the setting of

errno, replacing them with a discussion of IEEE exceptions where
appropriate.  Cross-reference fenv(3) whenever exceptions are
mentioned.

1 files changed, 7 insertions, 14 deletions

diff --git a/lib/msun/man/atanh.3 b/lib/msun/man/atanh.3
index cd9f276..10575c7 100644
--- a/lib/msun/man/atanh.3
+++ b/lib/msun/man/atanh.3
@@ -32,7 +32,7 @@
 .\"     from: @(#)atanh.3	5.2 (Berkeley) 5/6/91
 .\" $FreeBSD$
 .\"
-.Dd May 6, 1991
+.Dd January 14, 2005
 .Dt ATANH 3
 .Os
 .Sh NAME
@@ -67,23 +67,16 @@ functions
 return the inverse hyperbolic tangent of
 .Ar x
 if successful.
-On the
-.Tn VAX
-and
-.Tn Tahoe ,
-if the argument has absolute value
-bigger than or equal to 1,
-.Fn atanh
-sets the global variable
-.Va errno
-to
-.Er EDOM
-and
-a reserved operand fault is generated.
+If the argument has absolute value 1, a divide-by-zero exception
+is raised and an infinity is returned.
+If
+.Ar |x|
+> 1, an invalid exception is raised an an \*(Na is returned.
 .Sh SEE ALSO
 .Xr acosh 3 ,
 .Xr asinh 3 ,
 .Xr exp 3 ,
+.Xr fenv 3 ,
 .Xr math 3
 .Sh HISTORY
 The