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=pod
=head1 NAME
BIO_push, BIO_pop, BIO_set_next - add and remove BIOs from a chain
=head1 SYNOPSIS
#include <openssl/bio.h>
BIO *BIO_push(BIO *b, BIO *append);
BIO *BIO_pop(BIO *b);
void BIO_set_next(BIO *b, BIO *next);
=head1 DESCRIPTION
The BIO_push() function appends the BIO B<append> to B<b>, it returns
B<b>.
BIO_pop() removes the BIO B<b> from a chain and returns the next BIO
in the chain, or NULL if there is no next BIO. The removed BIO then
becomes a single BIO with no association with the original chain,
it can thus be freed or attached to a different chain.
BIO_set_next() replaces the existing next BIO in a chain with the BIO pointed to
by B<next>. The new chain may include some of the same BIOs from the old chain
or it may be completely different.
=head1 NOTES
The names of these functions are perhaps a little misleading. BIO_push()
joins two BIO chains whereas BIO_pop() deletes a single BIO from a chain,
the deleted BIO does not need to be at the end of a chain.
The process of calling BIO_push() and BIO_pop() on a BIO may have additional
consequences (a control call is made to the affected BIOs) any effects will
be noted in the descriptions of individual BIOs.
=head1 RETURN VALUES
BIO_push() returns the end of the chain, B<b>.
BIO_pop() returns the next BIO in the chain, or NULL if there is no next
BIO.
=head1 EXAMPLES
For these examples suppose B<md1> and B<md2> are digest BIOs, B<b64> is
a base64 BIO and B<f> is a file BIO.
If the call:
BIO_push(b64, f);
is made then the new chain will be B<b64-f>. After making the calls
BIO_push(md2, b64);
BIO_push(md1, md2);
the new chain is B<md1-md2-b64-f>. Data written to B<md1> will be digested
by B<md1> and B<md2>, B<base64> encoded and written to B<f>.
It should be noted that reading causes data to pass in the reverse
direction, that is data is read from B<f>, base64 B<decoded> and digested
by B<md1> and B<md2>. If the call:
BIO_pop(md2);
The call will return B<b64> and the new chain will be B<md1-b64-f> data can
be written to B<md1> as before.
=head1 SEE ALSO
L<bio>
=head1 HISTORY
The BIO_set_next() function was added in OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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