BIO_NEW(3ossl) OpenSSL BIO_NEW(3ossl)
NAME
BIO_new_ex, 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_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);
DESCRIPTION
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(3) 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.
RETURN VALUES
BIO_new(3) 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.
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.
BIO_new_ex() was added in OpenSSL 3.0.
EXAMPLES
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());
COPYRIGHT
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>.
3.3.2 2024-09-04 BIO_NEW(3ossl)
openssl 3.3.2 - Generated Fri Sep 6 16:34:29 CDT 2024