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BIO_FIND_TYPE(3)		    OpenSSL		      BIO_FIND_TYPE(3)

NAME
       BIO_find_type, BIO_next,	BIO_method_type	- BIO chain traversal

SYNOPSIS
	#include <openssl/bio.h>

	BIO *BIO_find_type(BIO *b, int bio_type);
	BIO *BIO_next(BIO *b);
	int BIO_method_type(const BIO *b);

DESCRIPTION
       The BIO_find_type() searches for	a BIO of a given type in a chain,
       starting	at BIO b. If type is a specific	type (such as BIO_TYPE_MEM)
       then a search is	made for a BIO of that type. If	type is	a general type
       (such as	BIO_TYPE_SOURCE_SINK) then the next matching BIO of the	given
       general type is searched	for. BIO_find_type() returns the next matching
       BIO or NULL if none is found.

       The following general types are defined:	BIO_TYPE_DESCRIPTOR,
       BIO_TYPE_FILTER,	and BIO_TYPE_SOURCE_SINK.

       For a list of the specific types, see the openssl/bio.h header file.

       BIO_next() returns the next BIO in a chain. It can be used to traverse
       all BIOs	in a chain or used in conjunction with BIO_find_type() to find
       all BIOs	of a certain type.

       BIO_method_type() returns the type of a BIO.

RETURN VALUES
       BIO_find_type() returns a matching BIO or NULL for no match.

       BIO_next() returns the next BIO in a chain.

       BIO_method_type() returns the type of the BIO b.

EXAMPLE
       Traverse	a chain	looking	for digest BIOs:

	BIO *btmp;

	btmp = in_bio; /* in_bio is chain to search through */
	do {
	    btmp = BIO_find_type(btmp, BIO_TYPE_MD);
	    if (btmp ==	NULL)
		break; /* Not found */
	    /* btmp is a digest	BIO, do	something with it ...*/
	    ...

	    btmp = BIO_next(btmp);
	} while	(btmp);

COPYRIGHT
       Copyright 2000-2016 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
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20		      BIO_FIND_TYPE(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | EXAMPLE | COPYRIGHT

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