Document the RETURN VALUES of BIO_method_type(3) and BIO_method_name(3)

for the various BIO types.

1 files changed, 13 insertions, 2 deletions

diff --git a/src/lib/libcrypto/man/BIO_f_null.3 b/src/lib/libcrypto/man/BIO_f_null.3
index 4944ced3a4..687d991b52 100644
--- a/src/lib/libcrypto/man/BIO_f_null.3
+++ b/src/lib/libcrypto/man/BIO_f_null.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: BIO_f_null.3,v 1.11 2022/12/23 16:59:39 schwarze Exp $
+.\" $OpenBSD: BIO_f_null.3,v 1.12 2023/04/11 16:58:43 schwarze Exp $
 .\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
 .\"
 .\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
@@ -48,7 +48,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: December 23 2022 $
+.Dd $Mdocdate: April 11 2023 $
 .Dt BIO_F_NULL 3
 .Os
 .Sh NAME
@@ -80,6 +80,17 @@ and any attempt to do so fails and returns
 .Sh RETURN VALUES
 .Fn BIO_f_null
 returns the null filter BIO method.
+.Pp
+When called on a null filter BIO object,
+.Xr BIO_method_type 3
+returns the constant
+.Dv BIO_TYPE_NULL_FILTER
+and
+.Xr BIO_method_name 3
+returns a pointer to the static string
+.Qq NULL filter ,
+not to be confused with a NUL string nor with a
+.Dv NULL pointer .
 .Sh SEE ALSO
 .Xr BIO_new 3
 .Sh HISTORY