tildefriends/deps/openssl/mingw64/share/man/man3/BIO_get_data.3

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.IX Title "BIO_GET_DATA 3"
.TH BIO_GET_DATA 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.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 non-zero 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 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>.