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-.\" $OpenBSD: BIO_set_callback.3,v 1.9 2018/03/29 20:42:17 schwarze Exp $
-.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
-.\" selective merge up to: OpenSSL 61f805c1 Jan 16 01:01:46 2018 +0800
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2016, 2017 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: March 29 2018 $
-.Dt BIO_SET_CALLBACK 3
-.Os
-.Sh NAME
-.Nm BIO_set_callback ,
-.Nm BIO_get_callback ,
-.Nm BIO_set_callback_arg ,
-.Nm BIO_get_callback_arg ,
-.Nm BIO_debug_callback
-.Nd BIO callback functions
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Ft void
-.Fo BIO_set_callback
-.Fa "BIO *b"
-.Fa "BIO_callback_fn cb"
-.Fc
-.Ft BIO_callback_fn
-.Fo BIO_get_callback
-.Fa "BIO *b"
-.Fc
-.Ft void
-.Fo BIO_set_callback_arg
-.Fa "BIO *b"
-.Fa "char *arg"
-.Fc
-.Ft char *
-.Fo BIO_get_callback_arg
-.Fa "const BIO *b"
-.Fc
-.Ft long
-.Fo BIO_debug_callback
-.Fa "BIO *bio"
-.Fa "int oper"
-.Fa "const char *argp"
-.Fa "int argi"
-.Fa "long argl"
-.Fa "long ret"
-.Fc
-.Ft typedef long
-.Fo "(*BIO_callback_fn)"
-.Fa "BIO *b"
-.Fa "int oper"
-.Fa "const char *argp"
-.Fa "int argi"
-.Fa "long argl"
-.Fa "long ret"
-.Fc
-.Sh DESCRIPTION
-.Fn BIO_set_callback
-and
-.Fn BIO_get_callback
-set and retrieve the BIO callback.
-The callback is called during most high level BIO operations.
-It can be used for debugging purposes to trace operations on a BIO
-or to modify its operation.
-.Pp
-.Fn BIO_set_callback_arg
-and
-.Fn BIO_get_callback_arg
-set and retrieve an argument for use in the callback.
-.Pp
-.Fn BIO_debug_callback
-is a standard debugging callback which prints
-out information relating to each BIO operation.
-If the callback argument is set, it is interpreted as a BIO
-to send the information to, otherwise stderr is used.
-.Pp
-.Fn BIO_callback_fn
-is the type of the callback function.
-The meaning of each argument is described below.
-.Pp
-The BIO the callback is attached to is passed in
-.Fa b .
-.Pp
-.Fa oper
-is set to the operation being performed.
-For some operations the callback is called twice,
-once before and once after the actual operation.
-The latter case has
-.Fa oper
-or'ed with
-.Dv BIO_CB_RETURN .
-.Pp
-The meaning of the arguments
-.Fa argp ,
-.Fa argi
-and
-.Fa argl
-depends on the value of
-.Fa oper
-(i.e. the operation being performed).
-.Pp
-When
-.Fa oper
-does not include
-.Dv BIO_CB_RETURN ,
-i.e. when the callback is invoked before an operation,
-the value passed into the callback via
-.Fa ret
-is always 1.
-In this case, if the callback returns a negative value, the library
-aborts the requested operation and instead returns the negative
-return value from the callback to the application.
-If the callback returns a non-negative value, that return value is
-ignored by the library, and the operation is performed normally.
-.Pp
-When
-.Fa oper
-includes
-.Dv BIO_CB_RETURN ,
-i.e. when the callback is invoked after an operation,
-the value passed into the callback via
-.Fa ret
-is the return value that the operation would return to the application
-if no callback were present.
-When a callback is present, the operation only passes this value
-to the callback and instead of it returns the return value of the
-callback to the application.
-.Pp
-The callback should normally simply return
-.Fa ret
-when it has finished processing, unless it specifically wishes to
-abort the operation or to modify the value returned to the application.
-.Ss Callback operations
-.Bl -tag -width Ds
-.It Fn BIO_free b
-.Fn callback b BIO_CB_FREE NULL 0L 0L 1L
-is called before the free operation.
-.It Fn BIO_read b out outl
-.Fn callback b BIO_CB_READ out outl 0L 1L
-is called before the read and
-.Fn callback b BIO_CB_READ|BIO_CB_RETURN out outl 0L ret
-after.
-.It Fn BIO_write b in inl
-.Fn callback b BIO_CB_WRITE in inl 0L 1L
-is called before the write and
-.Fn callback b BIO_CB_WRITE|BIO_CB_RETURN in inl 0L ret
-after.
-.It Fn BIO_gets b out outl
-.Fn callback b BIO_CB_GETS out outl 0L 1L
-is called before the operation and
-.Fn callback b BIO_CB_GETS|BIO_CB_RETURN out outl 0L ret
-after.
-.It Fn BIO_puts b in
-.Fn callback b BIO_CB_PUTS in 0 0L 1L
-is called before the operation and
-.Fn callback b BIO_CB_PUTS|BIO_CB_RETURN in 0 0L ret
-after.
-.It Fn BIO_ctrl b oper larg parg
-.Fn callback b BIO_CB_CTRL parg oper larg 1L
-is called before the call and
-.Fn callback b BIO_CB_CTRL|BIO_CB_RETURN parg oper larg ret
-after.
-.El
-.Sh RETURN VALUES
-.Fn BIO_get_callback
-returns a pointer to the function
-.Fa cb
-previously installed with
-.Fn BIO_set_callback ,
-or
-.Dv NULL
-if no callback was installed.
-.Pp
-.Fn BIO_get_callback_arg
-returns a pointer to the
-.Fa arg
-previously set with
-.Fn BIO_set_callback_arg ,
-or
-.Dv NULL
-if no such argument was set.
-.Pp
-.Fn BIO_debug_callback
-returns
-.Fa ret
-if the bit
-.Dv BIO_CB_RETURN
-is set in
-.Fa cmd ,
-or 1 otherwise.
-.Sh EXAMPLES
-The
-.Fn BIO_debug_callback
-function is a good example.
-Its source is in the file
-.Pa crypto/bio/bio_cb.c .
-.Sh SEE ALSO
-.Xr BIO_new 3
-.Sh HISTORY
-.Fn BIO_set_callback ,
-.Fn BIO_get_callback ,
-.Fn BIO_set_callback_arg ,
-and
-.Fn BIO_debug_callback
-first appeared in SSLeay 0.6.0.
-.Fn BIO_get_callback_arg
-first appeared in SSLeay 0.8.0.
-All these functions have been available since
-.Ox 2.4 .