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+=pod
+
+=head1 NAME
+
+BIO_set_data, BIO_get_data, BIO_set_init, BIO_get_init, BIO_set_shutdown,
+BIO_get_shutdown - functions for managing BIO state information
+
+=head1 SYNOPSIS
+
+ #include <openssl/bio.h>
+
+ void BIO_set_data(BIO *a, void *ptr);
+ void *BIO_get_data(BIO *a);
+ void BIO_set_init(BIO *a, int init);
+ int BIO_get_init(BIO *a);
+ void BIO_set_shutdown(BIO *a, int shut);
+ int BIO_get_shutdown(BIO *a);
+
+=head1 DESCRIPTION
+
+These functions are mainly useful when implementing a custom BIO.
+
+The BIO_set_data() function associates the custom data pointed to by B<ptr> with
+the BIO. This data can subsequently be retrieved via a call to BIO_get_data().
+This can be used by custom BIOs for storing implementation specific information.
+
+The BIO_set_init() function sets the value of the BIO's "init" flag to indicate
+whether initialisation has been completed for this BIO or not. A non-zero value
+indicates that initialisation is complete, whilst zero indicates that it is not.
+Often initialisation will complete during initial construction of the BIO. For
+some BIOs however, initialisation may not complete until after additional steps
+have occurred (for example through calling custom ctrls). The BIO_get_init()
+function returns the value of the "init" flag.
+
+The BIO_set_shutdown() and BIO_get_shutdown() functions set and get the state of
+this BIO's shutdown (i.e. BIO_CLOSE) flag. If set then the underlying resource
+is also closed when the BIO is freed.
+
+=head1 RETURN VALUES
+
+BIO_get_data() returns a pointer to the implementation specific custom data
+associated with this BIO, or NULL if none has been set.
+
+BIO_get_init() returns the state of the BIO's init flag.
+
+BIO_get_shutdown() returns the stat of the BIO's shutdown (i.e. BIO_CLOSE) flag.
+
+=head1 SEE ALSO
+
+L<bio>, L<BIO_meth_new>
+
+=head1 HISTORY
+
+The functions described here were added in OpenSSL 1.1.0.
+
+=head1 COPYRIGHT
+
+Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut