BIO_f_ssl() docs.

[openssl.git] / doc / crypto / BIO_ctrl.pod

diff --git a/doc/crypto/BIO_ctrl.pod b/doc/crypto/BIO_ctrl.pod
index dfec0196146e871aafb555f2493db58271c0ad95..aed2095925f1c644f52495235e6de19e640c90e3 100644 (file)
--- a/doc/crypto/BIO_ctrl.pod
+++ b/doc/crypto/BIO_ctrl.pod
@@ -2,7 +2,10 @@
 
 =head1 NAME
 
-       BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl - BIO control operations
+BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl, BIO_reset,
+BIO_flush, BIO_eof, BIO_set_close, BIO_get_close, BIO_pending,
+BIO_wpending, BIO_ctrl_pending, BIO_ctrl_wpending, BIO_get_info_callback,
+BIO_set_info_callback - BIO control operations
 
 =head1 SYNOPSIS
 
@@ -88,6 +91,15 @@ case of a file BIO some data may be available in the FILE structures
 internal buffers but it is not possible to determine this in a
 portably way. For other types of BIO they may not be supported.
 
+Filter BIOs if the do not internally handle a particular BIO_ctrl()
+operation usually pass the operation to the next BIO in the chain.
+This often means there is no need to locate the required BIO for
+a particular operation, it can be called on a chain and it will
+be automatically passed to the relevant BIO.
+
+Source/sink BIOs will return an error if the do not recognise the
+BIO_ctrl() operation.
+
 =head1 SEE ALSO
 
 TBA