SYNOPSIS: Added feature test macro requirements.

Added RETURN VALUE section.
Added ERRORS section; noted that errno is not set for underflow;
see http://sources.redhat.com/bugzilla/show_bug.cgi?id=6787.

man3/exp10.3

@@ -1,4 +1,6 @@
 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
+.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
+.\"     <mtk.manpages@gmail.com>
 .\"
 .\" Permission is granted to make and distribute verbatim copies of this
 .\" manual provided the copyright notice and this permission notice are
@@ -28,7 +30,7 @@
 .\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
 .\" Modified 2002-07-27 by Walter Harms
 .\" 	(walter.harms@informatik.uni-oldenburg.de)
-.TH EXP10 3  2002-07-27  "GNU" "Linux Programmer's Manual"
+.TH EXP10 3  2008-07-29  "GNU" "Linux Programmer's Manual"
 .SH NAME
 exp10, exp10f, exp10l \- base-10 exponential function
 .SH SYNOPSIS
@@ -50,8 +52,25 @@ The
 .BR exp10 ()
 function returns the value of 10
 raised to the power of \fIx\fP.
+.SH RETURN VALUE
+On success, these functions return the base-10 exponential value of
+.IR x .
+
+For various special cases, including the handling of infinity and NaN,
+as well as overflows and underflows, see
+.BR exp (3).
+.SH ERRORS
+See
+.BR math_error (7)
+for information on how to determine whether an error has occurred
+when calling these functions.
+
+For a discussion of the errors that can occur for these functions, see
+.BR exp (3).
+.\" FIXME . exp10 doesn't give ERANGE for an underflow, unlike exp() and exp2()
+.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6787
 .SH "CONFORMING TO"
-The function is a GNU extension.
+These functions are GNU extensions.
 .SH "SEE ALSO"
 .BR cbrt (3),
 .BR exp (3),