1BIO_FIND_TYPE(3)                    OpenSSL                   BIO_FIND_TYPE(3)
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NAME

6       BIO_find_type, BIO_next, BIO_method_type - BIO chain traversal
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SYNOPSIS

9        #include <openssl/bio.h>
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11        BIO *BIO_find_type(BIO *b, int bio_type);
12        BIO *BIO_next(BIO *b);
13        int BIO_method_type(const BIO *b);
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DESCRIPTION

16       The BIO_find_type() searches for a BIO of a given type in a chain,
17       starting at BIO b. If type is a specific type (such as BIO_TYPE_MEM)
18       then a search is made for a BIO of that type. If type is a general type
19       (such as BIO_TYPE_SOURCE_SINK) then the next matching BIO of the given
20       general type is searched for. BIO_find_type() returns the next matching
21       BIO or NULL if none is found.
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23       The following general types are defined: BIO_TYPE_DESCRIPTOR,
24       BIO_TYPE_FILTER, and BIO_TYPE_SOURCE_SINK.
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26       For a list of the specific types, see the openssl/bio.h header file.
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28       BIO_next() returns the next BIO in a chain. It can be used to traverse
29       all BIOs in a chain or used in conjunction with BIO_find_type() to find
30       all BIOs of a certain type.
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32       BIO_method_type() returns the type of a BIO.
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RETURN VALUES

35       BIO_find_type() returns a matching BIO or NULL for no match.
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37       BIO_next() returns the next BIO in a chain.
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39       BIO_method_type() returns the type of the BIO b.
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EXAMPLES

42       Traverse a chain looking for digest BIOs:
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44        BIO *btmp;
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46        btmp = in_bio; /* in_bio is chain to search through */
47        do {
48            btmp = BIO_find_type(btmp, BIO_TYPE_MD);
49            if (btmp == NULL)
50                break; /* Not found */
51            /* btmp is a digest BIO, do something with it ...*/
52            ...
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54            btmp = BIO_next(btmp);
55        } while (btmp);
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58       Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
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60       Licensed under the OpenSSL license (the "License").  You may not use
61       this file except in compliance with the License.  You can obtain a copy
62       in the file LICENSE in the source distribution or at
63       <https://www.openssl.org/source/license.html>.
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671.1.1d                            2019-10-03                  BIO_FIND_TYPE(3)
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