Document ERR_FATAL_ERROR(3), tweaked by me.

OpenSSL commit 036ba500f7886ca2e7231549fa574ec2cdd45cef
Author: Benjamin Kaduk <bkaduk@akamai.com>
Date:   Thu Dec 8 12:01:31 2016 -0600

1 files changed, 18 insertions, 7 deletions

diff --git a/src/lib/libcrypto/man/ERR_GET_LIB.3 b/src/lib/libcrypto/man/ERR_GET_LIB.3
index d67e8bdde6..03f56c09f6 100644
--- a/src/lib/libcrypto/man/ERR_GET_LIB.3
+++ b/src/lib/libcrypto/man/ERR_GET_LIB.3
@@ -1,5 +1,5 @@
-.\"     $OpenBSD: ERR_GET_LIB.3,v 1.4 2016/11/23 17:59:29 schwarze Exp $
-.\"     OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"     $OpenBSD: ERR_GET_LIB.3,v 1.5 2016/12/16 08:53:30 schwarze Exp $
+.\"     OpenSSL doc/man3/ERR_GET_LIB.pod 3dfda1a6 Dec 12 11:14:40 2016 -0500
 .\"
 .\" This file was written by Ulf Moeller <ulf@openssl.org>.
 .\" Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
@@ -48,13 +48,14 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: November 23 2016 $
+.Dd $Mdocdate: December 16 2016 $
 .Dt ERR_GET_LIB 3
 .Os
 .Sh NAME
 .Nm ERR_GET_LIB ,
 .Nm ERR_GET_FUNC ,
-.Nm ERR_GET_REASON
+.Nm ERR_GET_REASON ,
+.Nm ERR_FATAL_ERROR
 .Nd get library, function and reason codes for OpenSSL errors
 .Sh SYNOPSIS
 .In openssl/err.h
@@ -70,6 +71,10 @@
 .Fo ERR_GET_REASON
 .Fa "unsigned long e"
 .Fc
+.Ft int
+.Fo ERR_FATAL_ERROR
+.Fa "unsigned long e"
+.Fc
 .Sh DESCRIPTION
 The error code returned by
 .Xr ERR_get_error 3
@@ -95,13 +100,19 @@ are globally unique.
 However, when checking for sub-library specific reason codes, be sure to
 also compare the library number.
 .Pp
+.Fn ERR_FATAL_ERROR
+indicates whether a given error code is a fatal error.
+.Pp
+These functions are implemented as macros.
+.Sh RETURN VALUES
 .Fn ERR_GET_LIB ,
 .Fn ERR_GET_FUNC ,
 and
 .Fn ERR_GET_REASON
-are macros.
-.Sh RETURN VALUES
-The library number, function code, and reason code, respectively.
+return the library number, function code, and reason code, respectively.
+.Pp
+.Fn ERR_FATAL_ERROR
+returns non-zero if the error is fatal or 0 otherwise.
 .Sh SEE ALSO
 .Xr ERR 3 ,
 .Xr ERR_get_error 3