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.\" ========================================================================
.\"
.IX Title "BIO_NEW 3"
.TH BIO_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all \&\- BIO allocation and freeing functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIBIO_new()\fR function returns a new \s-1BIO\s0 using method \fBtype\fR.
.PP
\&\fIBIO_up_ref()\fR increments the reference count associated with the \s-1BIO\s0 object.
.PP
\&\fIBIO_free()\fR frees up a single \s-1BIO,\s0 \fIBIO_vfree()\fR also frees up a single \s-1BIO\s0
but it does not return a value.
If \fBa\fR is \s-1NULL\s0 nothing is done.
Calling \fIBIO_free()\fR 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.
.PP
\&\fIBIO_free_all()\fR 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 \fBa\fR is \s-1NULL\s0 nothing is done.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIBIO_new()\fR returns a newly created \s-1BIO\s0 or \s-1NULL\s0 if the call fails.
.PP
\&\fIBIO_up_ref()\fR and \fIBIO_free()\fR return 1 for success and 0 for failure.
.PP
\&\fIBIO_free_all()\fR and \fIBIO_vfree()\fR do not return values.
.SH "NOTES"
.IX Header "NOTES"
If \fIBIO_free()\fR is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting
in a memory leak.
.PP
Calling \fIBIO_free_all()\fR on a single \s-1BIO\s0 has the same effect as calling \fIBIO_free()\fR
on it other than the discarded return value.
.SH "HISTORY"
.IX Header "HISTORY"
\&\fIBIO_set()\fR was removed in OpenSSL 1.1.0 as \s-1BIO\s0 type is now opaque.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Create a memory \s-1BIO:\s0
.PP
.Vb 1
\& BIO *mem = BIO_new(BIO_s_mem());
.Ve
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.