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Title "BIO_NEW 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_new_ex, BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all \- BIO allocation and freeing functions Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" The BIO_new_ex() function returns a new \s-1BIO\s0 using method type associated with the library context libctx (see \s-1OSSL_LIB_CTX\s0\|(3)). The library context may be \s-1NULL\s0 to indicate the default library context.

The BIO_new() is the same as BIO_new_ex() except the default library context is always used.

\fBBIO_up_ref() increments the reference count associated with the \s-1BIO\s0 object.

\fBBIO_free() frees up a single \s-1BIO,\s0 BIO_vfree() also frees up a single \s-1BIO\s0 but it does not return a value. If a is \s-1NULL\s0 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 \s-1BIO_METHOD\s0 descriptions.

\fBBIO_free_all() frees up an entire \s-1BIO\s0 chain, it does not halt if an error occurs freeing up an individual \s-1BIO\s0 in the chain. If a is \s-1NULL\s0 nothing is done.

Header "RETURN VALUES" \fBBIO_new_ex() and BIO_new() return a newly created \s-1BIO\s0 or \s-1NULL\s0 if the call fails.

\fBBIO_up_ref() and BIO_free() return 1 for success and 0 for failure.

\fBBIO_free_all() and BIO_vfree() do not return values.

Header "NOTES" If BIO_free() is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting in a memory leak.

Calling BIO_free_all() on a single \s-1BIO\s0 has the same effect as calling BIO_free() on it other than the discarded return value.

Header "HISTORY" \fBBIO_set() was removed in OpenSSL 1.1.0 as \s-1BIO\s0 type is now opaque.

\fBBIO_new_ex() was added in OpenSSL 3.0.

Header "EXAMPLES" Create a memory \s-1BIO:\s0

.Vb 1 BIO *mem = BIO_new(BIO_s_mem()); .Ve

Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.