Document X509_get_default_cert_area(3).

Put it into this page because this is the code actually using it.
Despite its name and include file, it is unrelated to X.509
and unrelated to certificates: it is just the default directory
containing the library configuration file, openssl.cnf(5).

Author: schwarze

src/lib/libcrypto/man/CONF_modules_load_file.3

@@ -1,7 +1,25 @@
-.\"	$OpenBSD: CONF_modules_load_file.3,v 1.9 2019/06/14 13:41:31 schwarze Exp $
-.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\" $OpenBSD: CONF_modules_load_file.3,v 1.10 2021/08/03 18:49:30 schwarze Exp $
+.\" full merge up to: e9b77246 Jan 20 19:58:49 2017 +0100
+.\" selective merge up to: d090fc00 Feb 26 13:11:10 2019 +0800
 .\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
 .\" Copyright (c) 2000, 2015 The OpenSSL Project.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -48,12 +66,13 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: June 14 2019 $
+.Dd $Mdocdate: August 3 2021 $
 .Dt CONF_MODULES_LOAD_FILE 3
 .Os
 .Sh NAME
 .Nm CONF_modules_load_file ,
-.Nm CONF_modules_load
+.Nm CONF_modules_load ,
+.Nm X509_get_default_cert_area
 .Nd OpenSSL configuration functions
 .Sh SYNOPSIS
 .In openssl/conf.h
@@ -69,6 +88,9 @@
 .Fa "const char *appname"
 .Fa "unsigned long flags"
 .Fc
+.In openssl/x509.h
+.Ft const char *
+.Fn X509_get_default_cert_area void
 .Sh DESCRIPTION
 The function
 .Fn CONF_modules_load_file
@@ -156,12 +178,20 @@ Applications can use the
 function if they wish to load a configuration file themselves and
 have finer control over how errors are treated.
 .Sh RETURN VALUES
-These functions return 1 for success and zero or a negative value for
-failure.
+.Fn CONF_modules_load_file
+and
+.Fn CONF_modules_load
+return 1 for success and zero or a negative value for failure.
 If module errors are not ignored, the return code will reflect the return
 value of the failing module (this will always be zero or negative).
+.Pp
+.Fn X509_get_default_cert_area
+returns a pointer to the constant string
+.Qq "/etc/ssl" .
 .Sh FILES
 .Bl -tag -width /etc/ssl/openssl.cnf -compact
+.It Pa /etc/ssl
+standard configuration directory
 .It Pa /etc/ssl/openssl.cnf
 standard configuration file
 .El
@@ -244,6 +274,10 @@ if (fp == NULL) {
 .Xr OPENSSL_config 3 ,
 .Xr OPENSSL_load_builtin_modules 3
 .Sh HISTORY
+.Fn X509_get_default_cert_area
+first appeared in SSLeay 0.4.1 and has been available since
+.Ox 2.4 .
+.Pp
 .Fn CONF_modules_load_file
 and
 .Fn CONF_modules_load