BIO_get_data (3)

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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

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);

DESCRIPTION

These functions are mainly useful when implementing a custom

The BIO_set_data() function associates the custom data pointed to by ptr with the

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

's ``init'' flag to indicate whether initialisation has been completed for this 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 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

's shutdown (i.e. ) flag. If set then the underlying resource is also closed when the is freed.

RETURN VALUES

BIO_get_data() returns a pointer to the implementation specific custom data associated with this or if none has been set.

BIO_get_init() returns the state of the

's init flag.

BIO_get_shutdown() returns the stat of the

's shutdown (i.e. ) flag.

SEE ALSO

bio, BIO_meth_new

HISTORY

The functions described here were added in OpenSSL 1.1.0.

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

in the source distribution or at <www.openssl.org/source/license.html>.