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-.\" $OpenBSD: BIO_dup_chain.3,v 1.2 2023/04/09 06:27:52 jsg Exp $
-.\"
-.\" Copyright (c) 2022 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.
-.\"
-.Dd $Mdocdate: April 9 2023 $
-.Dt BIO_DUP_CHAIN 3
-.Os
-.Sh NAME
-.Nm BIO_dup_chain ,
-.Nm BIO_dup_state
-.Nd copy a BIO chain
-.Sh SYNOPSIS
-.In openssl/bio.h
-.Ft BIO *
-.Fn BIO_dup_chain "BIO *b"
-.Ft long
-.Fn BIO_dup_state "BIO *b" "BIO *new_bio"
-.Sh DESCRIPTION
-.Fn BIO_dup_chain
-copies the chain starting at
-.Fa b
-by iteratively copying
-.Fa b
-and all the BIOs following it
-and joining the copies in the same order as in the original chain.
-The copying operation is neither a deep copy nor a shallow copy.
-.Pp
-Some parts of the state of each BIO are copied,
-in particular with respect to the values returned by
-.Xr BIO_get_init 3 ,
-.Xr BIO_test_flags 3 ,
-and
-.Xr BIO_get_shutdown 3 .
-.\" XXX new_bio->num = bio->num;
-Other parts of the state of the BIOs are not copied
-but instead initialized to 0,
-in particular with respect to the values returned by
-.Xr BIO_number_read 3 ,
-.Xr BIO_number_written 3 ,
-and
-.Xr BIO_get_retry_reason 3 .
-The custom data pointer that can be used by custom BIO types
-and that can be retrieved with
-.Xr BIO_get_data 3
-is set to
-.Dv NULL
-in the copied BIO objects rather than copied.
-The reference count of each BIO in the copied chain is set to 1.
-.Pp
-For each BIO in the chain, copying the data that was set with
-.Xr BIO_set_ex_data 3
-is attempted, which may involve calling application-defined
-callback functions.
-.Pp
-The following pointers are copied
-rather than creating deep copies of the objects pointed to:
-.Bl -bullet
-.It
-The
-.Fa type
-pointer used for creating each BIO with
-.Xr BIO_new 3 ,
-implying that functions like
-.Xr BIO_method_name 3
-return pointers to the same strings for the BIOs in the copied chain,
-and that these strings are not copied.
-.It
-All function pointers, in particular those installed with
-.Xr BIO_set_callback_ex 3
-and
-.Xr BIO_get_callback_ex 3 .
-.It
-The pointer installed with
-.Xr BIO_set_callback_arg 3 ,
-which implies that for BIOs using
-.Xr BIO_debug_callback 3 ,
-those in the copied chain use the same BIOs for debugging output
-as the corresponding ones in the original chain,
-and none of the debugging output BIOs are copied.
-.El
-.Pp
-.Fn BIO_dup_state
-is a macro that calls
-.Xr BIO_ctrl 3
-with a
-.Fa cmd
-argument of
-.Dv BIO_CTRL_DUP .
-It is automatically called for each BIO during
-.Fn BIO_dup_chain
-after the copied BIO is initialized and data copied into it,
-but before the data set with
-.Xr BIO_set_ex_data 3
-is copied into the new BIO and before it is linked into the new chain.
-.Pp
-This control operation may modify the operation of
-.Fn BIO_dup_chain
-for particular types of BIOs contained in the chain,
-for example initializing or copying additional data.
-For BIO types provided by the library, such additional effects
-are documented in the respective manual pages, in particular in
-.Xr BIO_f_buffer 3 ,
-.Xr BIO_f_cipher 3 ,
-.Xr BIO_f_md 3 ,
-.Xr BIO_f_ssl 3 ,
-.Xr BIO_s_bio 3 ,
-and
-.Xr BIO_s_connect 3 .
-.Sh RETURN VALUES
-.Fn BIO_dup_chain
-returns a pointer to the newly allocated copy of the BIO
-.Fa b
-on success or
-.Dv NULL
-on failure .
-.Pp
-.Fn BIO_dup_state
-returns 1 on success or a value less than or equal to zero on failure.
-.Sh SEE ALSO
-.Xr BIO_get_data 3 ,
-.Xr BIO_new 3 ,
-.Xr BIO_next 3 ,
-.Xr BIO_push 3
-.Sh HISTORY
-.Fn BIO_dup_chain
-and
-.Fn BIO_dup_state
-first appeared in SSLeay 0.8.0 and have been available since
-.Ox 2.4 .