NAME

       BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and freeing
       functions

SYNOPSIS

        #include <openssl/bio.h>

        BIO *  BIO_new(const BIO_METHOD *type);
        int    BIO_up_ref(BIO *a);
        int    BIO_free(BIO *a);
        void   BIO_vfree(BIO *a);
        void   BIO_free_all(BIO *a);

DESCRIPTION

       The BIO_new() function returns a new BIO using method type.

       BIO_up_ref() increments the reference count associated with the BIO object.

       BIO_free() frees up a single BIO, BIO_vfree() also frees up a single BIO but it does not
       return a value.  If a is NULL nothing is done.  Calling BIO_free() may also have some
       effect on the underlying I/O structure, for example it may close the file being referred
       to under certain circumstances. For more details see the individual BIO_METHOD
       descriptions.

       BIO_free_all() frees up an entire BIO chain, it does not halt if an error occurs freeing
       up an individual BIO in the chain.  If a is NULL nothing is done.

RETURN VALUES

       BIO_new() returns a newly created BIO or NULL if the call fails.

       BIO_up_ref() and BIO_free() return 1 for success and 0 for failure.

       BIO_free_all() and BIO_vfree() do not return values.

NOTES

       If BIO_free() is called on a BIO chain it will only free one BIO resulting in a memory
       leak.

       Calling BIO_free_all() on a single BIO has the same effect as calling BIO_free() on it
       other than the discarded return value.

HISTORY

       BIO_set() was removed in OpenSSL 1.1.0 as BIO type is now opaque.

EXAMPLE

       Create a memory BIO:

        BIO *mem = BIO_new(BIO_s_mem());

COPYRIGHT

       Copyright 2000-2016 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 <https://www.openssl.org/source/license.html>.