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-.\" $OpenBSD: BIO_new.3,v 1.28 2023/07/26 20:01:04 tb Exp $
-.\" full merge up to:
-.\" OpenSSL man3/BIO_new.pod fb46be03 Feb 26 11:51:31 2016 +0000
-.\" OpenSSL man7/bio.pod 631c37be Dec 12 16:56:50 2017 +0100
-.\" partial merge up to:
-.\" OpenSSL man3/BIO_new.pod e9b77246 Jan 20 19:58:49 2017 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2015, 2016 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-.\" OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: July 26 2023 $
-.Dt BIO_NEW 3
-.Os
-.Sh NAME
-.Nm BIO_new ,
-.Nm BIO_up_ref ,
-.Nm BIO_set ,
-.Nm BIO_free ,
-.Nm BIO_vfree ,
-.Nm BIO_free_all
-.Nd construct and destruct I/O abstraction objects
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Ft BIO *
-.Fo BIO_new
-.Fa "const BIO_METHOD *type"
-.Fc
-.Ft int
-.Fo BIO_up_ref
-.Fa "BIO *a"
-.Fc
-.Ft int
-.Fo BIO_set
-.Fa "BIO *a"
-.Fa "const BIO_METHOD *type"
-.Fc
-.Ft int
-.Fo BIO_free
-.Fa "BIO *a"
-.Fc
-.Ft void
-.Fo BIO_vfree
-.Fa "BIO *a"
-.Fc
-.Ft void
-.Fo BIO_free_all
-.Fa "BIO *a"
-.Fc
-.Sh DESCRIPTION
-A
-.Vt BIO
-is an I/O abstraction object, hiding many of the underlying I/O
-details from an application.
-If an application uses BIOs for its I/O, it can transparently handle
-SSL connections, unencrypted network connections, and file I/O.
-.Pp
-The
-.Fn BIO_new
-function constructs a new
-.Vt BIO
-using the method
-.Fa type
-and sets its reference count to 1.
-There are two groups of BIO types, source/sink BIOs and filter BIOs.
-.Pp
-Source/sink BIOs provide input or consume output.
-Examples include socket BIOs and file BIOs.
-.Pp
-Filter BIOs take data from one BIO and pass it through to another,
-or to the application, forming a chain of BIOs.
-The data may be left unmodified (for example by a message digest BIO)
-or translated (for example by an encryption BIO).
-The effect of a filter BIO may change according to the I/O operation
-it is performing: for example an encryption BIO encrypts data
-if it is written to and decrypts data if it is read from.
-.Pp
-Some BIOs (such as memory BIOs) can be used immediately after calling
-.Fn BIO_new .
-Others (such as file BIOs) need some additional initialization, and
-utility functions exists to construct and initialize such BIOs.
-.Pp
-Normally the
-.Fa type
-argument is supplied by a function which returns a pointer to a
-.Vt BIO_METHOD .
-There is a naming convention for such functions:
-the methods for source/sink BIOs are called
-.Fn BIO_s_*
-and those for filter BIOs
-.Fn BIO_f_* .
-.Pp
-.Fn BIO_up_ref
-increments the reference count of
-.Fa a
-by 1.
-.Pp
-.Fn BIO_set
-is a deprecated function to initialize an unused
-.Vt BIO
-structure located in static memory or on the stack,
-to set its method to
-.Fa type ,
-and to set its reference count to 1.
-It must not be called on
-.Vt BIO
-objects created with
-.Fn BIO_new ,
-nor on objects that were already used.
-.Pp
-.Fn BIO_free
-and
-.Fn BIO_vfree
-decrement the reference count of
-.Fa a
-by 1, and if the reference count reaches 0, they destruct the single
-.Vt BIO
-.Fa a ,
-which may also have some effect on the
-underlying I/O structure, for example it may close the file being
-referred to under certain circumstances.
-If
-.Fa a
-is a
-.Dv NULL
-pointer, no action occurs.
-If
-.Fn BIO_free
-is called on a BIO chain, it destructs at most one BIO,
-resulting in a memory leak.
-.Pp
-.Fn BIO_free_all
-calls
-.Fn BIO_free
-on
-.Fa a
-and on all following
-.Vt BIO
-objects in the chain.
-As soon as the reference count of a
-.Vt BIO
-is still non-zero after calling
-.Fn BIO_free
-on it, the function
-.Fn BIO_free_all
-returns right away and refrains from freeing the remaining
-.Vt BIO
-objects in the chain.
-It does not halt if an error occurs
-destructing an individual BIO in the chain.
-If
-.Fa a
-is a
-.Dv NULL
-pointer, no action occurs.
-Calling
-.Fn BIO_free_all
-on a single BIO has the same effect as
-.Fn BIO_vfree .
-.Pp
-Common I/O functions are documented in
-.Xr BIO_read 3 .
-Forming chains is explained in
-.Xr BIO_push 3 ;
-inspecting them is explained in
-.Xr BIO_find_type 3 .
-For more details about the different kinds of BIOs, see the individual
-.Vt BIO_METHOD
-manual pages.
-.Sh RETURN VALUES
-.Fn BIO_new
-returns a newly constructed
-.Vt BIO
-object or
-.Dv NULL
-on failure.
-.Pp
-.Fn BIO_up_ref ,
-.Fn BIO_set ,
-and
-.Fn BIO_free
-return 1 for success or 0 for failure.
-.Sh EXAMPLES
-Create a memory BIO:
-.Pp
-.Dl BIO *mem = BIO_new(BIO_s_mem());
-.Sh SEE ALSO
-.Xr BIO_accept 3 ,
-.Xr BIO_ctrl 3 ,
-.Xr BIO_dump 3 ,
-.Xr BIO_dup_chain 3 ,
-.Xr BIO_f_base64 3 ,
-.Xr BIO_f_buffer 3 ,
-.Xr BIO_f_cipher 3 ,
-.Xr BIO_f_md 3 ,
-.Xr BIO_f_null 3 ,
-.Xr BIO_f_ssl 3 ,
-.Xr BIO_find_type 3 ,
-.Xr BIO_get_ex_new_index 3 ,
-.Xr BIO_meth_new 3 ,
-.Xr BIO_new_CMS 3 ,
-.Xr BIO_printf 3 ,
-.Xr BIO_push 3 ,
-.Xr BIO_read 3 ,
-.Xr BIO_s_accept 3 ,
-.Xr BIO_s_bio 3 ,
-.Xr BIO_s_connect 3 ,
-.Xr BIO_s_datagram 3 ,
-.Xr BIO_s_fd 3 ,
-.Xr BIO_s_file 3 ,
-.Xr BIO_s_mem 3 ,
-.Xr BIO_s_null 3 ,
-.Xr BIO_s_socket 3 ,
-.Xr BIO_set_callback 3 ,
-.Xr BIO_set_data 3 ,
-.Xr BIO_should_retry 3 ,
-.Xr BUF_MEM_new 3 ,
-.Xr crypto 3
-.Sh HISTORY
-.Fn BIO_new ,
-.Fn BIO_set ,
-and
-.Fn BIO_free
-first appeared in SSLeay 0.6.0.
-.Fn BIO_free_all
-first appeared in SSLeay 0.6.6.
-All these functions have been available since
-.Ox 2.4 .
-.Pp
-.Fn BIO_vfree
-first appeared in OpenSSL 0.9.6 and has been available since
-.Ox 2.9 .
-.Pp
-.Fn BIO_up_ref
-first appeared in OpenSSL 1.1.0 and has been available since
-.Ox 6.3 .