All annotated occurences of "errno" in intro(2) are .Va,
except this one which is .Dv - is that intended?
The others talk about the "varible" errno, this one is
an "identifier which expands to an addressable location",
whatever that means.
Jan
Index: intro.2
===================================================================
RCS file: /cvs/src/lib/libc/sys/intro.2,v
retrieving revision 1.65
diff -u -p -r1.65 intro.2
--- intro.2 5 Sep 2017 03:06:26 -0000 1.65
+++ intro.2 5 Dec 2017 22:01:26 -0000
@@ -51,7 +51,7 @@ Programs may be restricted to a subset o
.\"<more later...>
.Sh DIAGNOSTICS
Nearly all of the system calls provide an error number via the identifier
-.Dv errno ,
+.Va errno ,
which expands to an addressable location of type
.Vt int .
The address of
