document ENOTSUP wxallowed/wxneeded behaviour more clearly; ok kurt

diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
index cdd744c..2210a8e 100644 (file)
--- a/lib/libc/sys/mmap.2
+++ b/lib/libc/sys/mmap.2
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: mmap.2,v 1.65 2019/12/21 05:23:38 jsg Exp $
+.\"    $OpenBSD: mmap.2,v 1.66 2021/03/02 17:43:04 deraadt Exp $
 .\"    $NetBSD: mmap.2,v 1.5 1995/06/24 10:48:59 cgd Exp $
 .\"
 .\" Copyright (c) 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"    @(#)mmap.2      8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: December 21 2019 $
+.Dd $Mdocdate: March 2 2021 $
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -291,11 +291,15 @@ The accesses requested in the
 argument are not allowed.
 In particular,
 .Dv PROT_WRITE | PROT_EXEC
-mappings are not permitted in most binaries (see
+mappings are not permitted unless the filesystem is mounted
+.Cm wxallowed
+and the process is link-time tagged with
+.Cm wxneeded .
+(See also
 .Dv kern.wxabort
 in
 .Xr sysctl 2
-for more information).
+for a method to diagnose failure).
 .El
 .Sh SEE ALSO
 .Xr madvise 2 ,