From fdfa00ba835ea7dd8128a8ae0ea4f191197a7d06 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 15 Apr 2010 08:32:50 +0000
Subject: [PATCH] Still reference struct __sigaction with clarification when
 this form of argument declaration is needed.

Discussed with:	bde
MFC after:	3 days
---
 lib/libc/sys/sigaction.2 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2
index 9bd4c9e4f365..51b6c47c78fc 100644
--- a/lib/libc/sys/sigaction.2
+++ b/lib/libc/sys/sigaction.2
@@ -496,6 +496,16 @@ or
 .Dv SIG_IGN
 this way.
 .Pp
+If preprocessing symbol
+.Va _POSIX_C_SOURCE
+with the value >= 199309 is not defined, the following declaration for
+the handler shall be used:
+.Bl -tag -offset indent -width short
+.It Tn POSIX Dv SA_SIGINFO :
+.Ft void
+.Fn handler int "struct __sigaction *" "void *" ;
+.El
+.Pp
 If the
 .Dv SA_SIGINFO
 flag is not set, the handler function should match