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Title "BIO_FIND_TYPE 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_find_type, BIO_next, BIO_method_type - BIO chain traversal Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" The BIO_find_type() searches for a \s-1BIO\s0 of a given type in a chain, starting at \s-1BIO\s0 b. If type is a specific type (such as \s-1BIO_TYPE_MEM\s0) then a search is made for a \s-1BIO\s0 of that type. If type is a general type (such as \fB\s-1BIO_TYPE_SOURCE_SINK\s0) then the next matching \s-1BIO\s0 of the given general type is searched for. BIO_find_type() returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is found.

The following general types are defined: \fB\s-1BIO_TYPE_DESCRIPTOR\s0, \s-1BIO_TYPE_FILTER\s0, and \s-1BIO_TYPE_SOURCE_SINK\s0.

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

\fBBIO_next() returns the next \s-1BIO\s0 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.

\fBBIO_method_type() returns the type of a \s-1BIO.\s0

Header "RETURN VALUES" \fBBIO_find_type() returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match.

\fBBIO_next() returns the next \s-1BIO\s0 in a chain.

\fBBIO_method_type() returns the type of the \s-1BIO\s0 b.

Header "EXAMPLES" Traverse a chain looking for digest BIOs:

.Vb 1 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); .Ve

Header "COPYRIGHT" Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.