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BIO_method_type.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_find_type, BIO_next, BIO_method_type \- BIO chain traversal .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBBIO_find_type()\fR searches for a \s-1BIO\s0 of a given type in a chain, starting at \s-1BIO\s0 \fBb\fR. If \fBtype\fR is a specific type (such as \fB\s-1BIO_TYPE_MEM\s0\fR) then a search is made for a \s-1BIO\s0 of that type. If \fBtype\fR is a general type (such as \&\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR) then the next matching \s-1BIO\s0 of the given general type is searched for. \fBBIO_find_type()\fR returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is found. .PP The following general types are defined: \&\fB\s-1BIO_TYPE_DESCRIPTOR\s0\fR, \fB\s-1BIO_TYPE_FILTER\s0\fR, and \fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR. .PP For a list of the specific types, see the \fBopenssl/bio.h\fR header file. .PP \&\fBBIO_next()\fR 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 \fBBIO_find_type()\fR to find all BIOs of a certain type. .PP \&\fBBIO_method_type()\fR returns the type of a \s-1BIO.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_find_type()\fR returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match. .PP \&\fBBIO_next()\fR returns the next \s-1BIO\s0 in a chain. .PP \&\fBBIO_method_type()\fR returns the type of the \s-1BIO\s0 \fBb\fR. .SH "EXAMPLES" .IX Header "EXAMPLES" Traverse a chain looking for digest BIOs: .PP .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 .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP 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>.
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