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✏️ Editing: BIO_get_data.3

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.\"
.IX Title "BIO_GET_DATA 3"
.TH BIO_GET_DATA 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.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>.

MR SKB