Updated: 2021/Apr/14


BIO_new(3)                          OpenSSL                         BIO_new(3)



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

LIBRARY
       libcrypto, -lcrypto

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.

EXAMPLES
       Create a memory BIO:

        BIO *mem = BIO_new(BIO_s_mem());

COPYRIGHT
       Copyright 2000-2019 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>.



1.1.1i                            2020-01-23                        BIO_new(3)