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-rw-r--r--doc/apps/s_server.pod8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/apps/s_server.pod b/doc/apps/s_server.pod
index cd8a3ef747..706e039b5a 100644
--- a/doc/apps/s_server.pod
+++ b/doc/apps/s_server.pod
@@ -73,6 +73,7 @@ B<openssl> B<s_server>
[B<-dtls1>]
[B<-dtls1_2>]
[B<-listen>]
+[B<-async>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-no_dhe>]
@@ -312,6 +313,13 @@ them or not. Any without a cookie will be responded to with a
HelloVerifyRequest. If a ClientHello with a cookie is received then s_server
will connect to that peer and complete the handshake.
+=item B<-async>
+
+switch on asynchronous mode. Cryptographic operations will be performed
+asynchronously. This will only have an effect if an asynchronous capable engine
+is also used via the B<-engine> option. For test purposes the dummy async engine
+(dasync) can be used (if available).
+
=item B<-bugs>
there are several known bug in SSL and TLS implementations. Adding this