From 6f22817995d8345a6f7f126f7fb0ea836845780e Mon Sep 17 00:00:00 2001
From: Philip Guenther <guenther@cvs.openbsd.org>
Date: Mon, 15 Sep 2014 05:51:25 +0000
Subject: Mention that SIGTHR is both local and weird

"seems fair" schwarze@
---
 lib/libc/sys/sigaction.2 | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'lib')

diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2
index e3e3655ad4a..93b9d9d5438 100644
--- a/lib/libc/sys/sigaction.2
+++ b/lib/libc/sys/sigaction.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sigaction.2,v 1.64 2014/09/10 07:04:23 guenther Exp $
+.\"	$OpenBSD: sigaction.2,v 1.65 2014/09/15 05:51:24 guenther Exp $
 .\"	$NetBSD: sigaction.2,v 1.7 1995/10/12 15:41:16 jtc Exp $
 .\"
 .\" Copyright (c) 1980, 1990, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"	@(#)sigaction.2	8.2 (Berkeley) 4/3/94
 .\"
-.Dd $Mdocdate: September 10 2014 $
+.Dd $Mdocdate: September 15 2014 $
 .Dt SIGACTION 2
 .Os
 .Sh NAME
@@ -447,6 +447,16 @@ are Berkeley extensions.
 These signals are available on most
 .Bx Ns -derived
 systems.
+The
+.Dv SIGTHR
+signal is specific to
+.Ox
+and is part of the
+implementation of thread cancellation;
+.Fa sigaction
+and other signal interfaces may reject attempts to use or alter the
+handling of
+.Dv SIGTHR .
 .Pp
 The following functions are either reentrant or not interruptible
 by signals and are async-signal safe.
-- 
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