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BIO_set_data.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_set_data, BIO_get_data, BIO_set_init, BIO_get_init, BIO_set_shutdown, BIO_get_shutdown \- functions for managing BIO state information .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> \& \& void BIO_set_data(BIO *a, void *ptr); \& void *BIO_get_data(BIO *a); \& void BIO_set_init(BIO *a, int init); \& int BIO_get_init(BIO *a); \& void BIO_set_shutdown(BIO *a, int shut); \& int BIO_get_shutdown(BIO *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions are mainly useful when implementing a custom \s-1BIO.\s0 .PP The \fBBIO_set_data()\fR function associates the custom data pointed to by \fBptr\fR with the \s-1BIO.\s0 This data can subsequently be retrieved via a call to \fBBIO_get_data()\fR. This can be used by custom BIOs for storing implementation specific information. .PP The \fBBIO_set_init()\fR function sets the value of the \s-1BIO\s0's \*(L"init\*(R" flag to indicate whether initialisation has been completed for this \s-1BIO\s0 or not. A nonzero value indicates that initialisation is complete, whilst zero indicates that it is not. Often initialisation will complete during initial construction of the \s-1BIO.\s0 For some BIOs however, initialisation may not complete until after additional steps have occurred (for example through calling custom ctrls). The \fBBIO_get_init()\fR function returns the value of the \*(L"init\*(R" flag. .PP The \fBBIO_set_shutdown()\fR and \fBBIO_get_shutdown()\fR functions set and get the state of this \s-1BIO\s0's shutdown (i.e. \s-1BIO_CLOSE\s0) flag. If set then the underlying resource is also closed when the \s-1BIO\s0 is freed. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_get_data()\fR returns a pointer to the implementation specific custom data associated with this \s-1BIO,\s0 or \s-1NULL\s0 if none has been set. .PP \&\fBBIO_get_init()\fR returns the state of the \s-1BIO\s0's init flag. .PP \&\fBBIO_get_shutdown()\fR returns the stat of the \s-1BIO\s0's shutdown (i.e. \s-1BIO_CLOSE\s0) flag. .SH "SEE ALSO" .IX Header "SEE ALSO" bio, BIO_meth_new .SH "HISTORY" .IX Header "HISTORY" The functions described here were added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2020 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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