BIO_new_ex, BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all - BIO
allocation and freeing functions
#include <openssl/bio.h>
BIO *BIO_new_ex(OSSL_LIB_CTX *libctx, const BIO_METHOD *type);
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);
The
BIO_new_ex() function returns a new BIO using method
type
associated with the library context
libctx (see
OSSL_LIB_CTX(3)). The library context may be NULL to indicate the
default library context.
The
BIO_new() is the same as
BIO_new_ex() except the default
library context is always used.
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.
BIO_new_ex() and
BIO_new() return 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.
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.
BIO_set() was removed in OpenSSL 1.1.0 as BIO type is now opaque.
BIO_new_ex() was added in OpenSSL 3.0.
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.