tan.3: errno is now correctly set to EDOM on a domain error

http://sources.redhat.com/bugzilla/show_bug.cgi?id=6782
was (silently) resolved.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man3/tan.3

@@ -30,7 +30,7 @@
 .\" Modified 2002-07-27 by Walter Harms
 .\" 	(walter.harms@informatik.uni-oldenburg.de)
 .\"
-.TH TAN 3 2008-08-05 ""  "Linux Programmer's Manual"
+.TH TAN 3 2010-09-11 ""  "Linux Programmer's Manual"
 .SH NAME
 tan, tanf, tanl \- tangent function
 .SH SYNOPSIS
@@ -102,9 +102,10 @@ when calling these functions.
 The following errors can occur:
 .TP
 Domain error: \fIx\fP is an infinity
-.\" .I errno
-.\" is set to
-.\" .BR EDOM .
+.I errno
+is set to
+.BR EDOM
+(but see BUGS).
 An invalid floating-point exception
 .RB ( FE_INVALID )
 is raised.
@@ -121,15 +122,19 @@ is raised.
 .PP
 These functions do not set
 .IR errno .
-.\" FIXME . Is it intentional that these functions do not set
-.\" errno (at least for domain error)?
-.\" Bug raised: http://sourceware.org/bugzilla/show_bug.cgi?id=6782
 .SH "CONFORMING TO"
 C99, POSIX.1-2001.
 The variant returning
 .I double
 also conforms to
 SVr4, 4.3BSD, C89.
+.SH BUGS
+Before version 2.10, the glibc implementation did not set
+.\" http://sourceware.org/bugzilla/show_bug.cgi?id=6782
+.I errno
+to
+.B EDOM
+when a domain error occurred.
 .SH "SEE ALSO"
 .BR acos (3),
 .BR asin (3),