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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); \& \& #define BIO_method_type(b) ((b)\->method\->type) \& \& #define BIO_TYPE_NONE 0 \& #define BIO_TYPE_MEM (1|0x0400) \& #define BIO_TYPE_FILE (2|0x0400) \& \& #define BIO_TYPE_FD (4|0x0400|0x0100) \& #define BIO_TYPE_SOCKET (5|0x0400|0x0100) \& #define BIO_TYPE_NULL (6|0x0400) \& #define BIO_TYPE_SSL (7|0x0200) \& #define BIO_TYPE_MD (8|0x0200) \& #define BIO_TYPE_BUFFER (9|0x0200) \& #define BIO_TYPE_CIPHER (10|0x0200) \& #define BIO_TYPE_BASE64 (11|0x0200) \& #define BIO_TYPE_CONNECT (12|0x0400|0x0100) \& #define BIO_TYPE_ACCEPT (13|0x0400|0x0100) \& #define BIO_TYPE_PROXY_CLIENT (14|0x0200) \& #define BIO_TYPE_PROXY_SERVER (15|0x0200) \& #define BIO_TYPE_NBIO_TEST (16|0x0200) \& #define BIO_TYPE_NULL_FILTER (17|0x0200) \& #define BIO_TYPE_BER (18|0x0200) \& #define BIO_TYPE_BIO (19|0x0400) \& \& #define BIO_TYPE_DESCRIPTOR 0x0100 \& #define BIO_TYPE_FILTER 0x0200 \& #define BIO_TYPE_SOURCE_SINK 0x0400 .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fIBIO_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 \s-1BIO_TYPE_MEM\s0) 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. \fIBIO_find_type()\fR returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is found. .PP Note: not all the \fBBIO_TYPE_*\fR types above have corresponding \s-1BIO\s0 implementations. .PP \&\fIBIO_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 \fIBIO_find_type()\fR to find all BIOs of a certain type. .PP \&\fIBIO_method_type()\fR returns the type of a \s-1BIO.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIBIO_find_type()\fR returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match. .PP \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain. .PP \&\fIBIO_method_type()\fR returns the type of the \s-1BIO \s0\fBb\fR. .SH "NOTES" .IX Header "NOTES" \&\fIBIO_next()\fR was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a \s-1BIO\s0 chain or find multiple matches using \fIBIO_find_type()\fR. Previous versions had to use: .PP .Vb 1 \& next = bio\->next_bio; .Ve .SH "BUGS" .IX Header "BUGS" \&\fIBIO_find_type()\fR in OpenSSL 0.9.5a and earlier could not be safely passed a \&\s-1NULL\s0 pointer for the \fBb\fR argument. .SH "EXAMPLE" .IX Header "EXAMPLE" Traverse a chain looking for digest BIOs: .PP .Vb 2 \& 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 "SEE ALSO" .IX Header "SEE ALSO" \&\s-1TBA\s0
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