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Diffstat (limited to 'openssl-1.1.0h/doc/crypto/BIO_find_type.pod')
-rw-r--r-- | openssl-1.1.0h/doc/crypto/BIO_find_type.pod | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/openssl-1.1.0h/doc/crypto/BIO_find_type.pod b/openssl-1.1.0h/doc/crypto/BIO_find_type.pod new file mode 100644 index 0000000..ff7b488 --- /dev/null +++ b/openssl-1.1.0h/doc/crypto/BIO_find_type.pod @@ -0,0 +1,69 @@ +=pod + +=head1 NAME + +BIO_find_type, BIO_next, BIO_method_type - BIO chain traversal + +=head1 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); + +=head1 DESCRIPTION + +The BIO_find_type() searches for a BIO of a given type in a chain, starting +at BIO B<b>. If B<type> is a specific type (such as B<BIO_TYPE_MEM>) then a search +is made for a BIO of that type. If B<type> is a general type (such as +B<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: +B<BIO_TYPE_DESCRIPTOR>, B<BIO_TYPE_FILTER>, and B<BIO_TYPE_SOURCE_SINK>. + +For a list of the specific types, see the B<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. + +=head1 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<b>. + +=head1 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); + + +=head1 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 +L<https://www.openssl.org/source/license.html>. + +=cut |