Index: lib/libc/sys/sigaction.2
===================================================================
--- lib/libc/sys/sigaction.2
+++ lib/libc/sys/sigaction.2
@@ -28,7 +28,7 @@
 .\"	From: @(#)sigaction.2	8.2 (Berkeley) 4/3/94
 .\" $FreeBSD$
 .\"
-.Dd September 30, 2016
+.Dd August 12, 2017
 .Dt SIGACTION 2
 .Os
 .Sh NAME
@@ -40,11 +40,15 @@
 .In signal.h
 .Bd -literal
 struct  sigaction {
-        void    (*sa_handler)(int);
-        void    (*sa_sigaction)(int, siginfo_t *, void *);
+        union { 
+                void    (*__sa_handler)(int);
+                void    (*__sa_sigaction)(int, struct __siginfo *, void *);
+        } __sigaction_u;                /* signal handler */
         int     sa_flags;               /* see signal options below */
         sigset_t sa_mask;               /* signal mask to apply */
 };
+#define sa_handler      __sigaction_u.__sa_handler
+#define sa_sigaction    __sigaction_u.__sa_sigaction
 .Ed
 .Ft int
 .Fo sigaction