188 lines
6.2 KiB
Groff
Executable File
188 lines
6.2 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BIO_GET_DATA 3"
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.TH BIO_GET_DATA 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_set_data, BIO_get_data, BIO_set_init, BIO_get_init, BIO_set_shutdown,
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BIO_get_shutdown \- functions for managing BIO state information
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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\&
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\& void BIO_set_data(BIO *a, void *ptr);
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\& void *BIO_get_data(BIO *a);
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\& void BIO_set_init(BIO *a, int init);
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\& int BIO_get_init(BIO *a);
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\& void BIO_set_shutdown(BIO *a, int shut);
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\& int BIO_get_shutdown(BIO *a);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions are mainly useful when implementing a custom \s-1BIO\s0.
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.PP
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The \fIBIO_set_data()\fR function associates the custom data pointed to by \fBptr\fR with
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the \s-1BIO\s0. This data can subsequently be retrieved via a call to \fIBIO_get_data()\fR.
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This can be used by custom BIOs for storing implementation specific information.
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.PP
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The \fIBIO_set_init()\fR function sets the value of the \s-1BIO\s0's \*(L"init\*(R" flag to indicate
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whether initialisation has been completed for this \s-1BIO\s0 or not. A nonzero value
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indicates that initialisation is complete, whilst zero indicates that it is not.
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Often initialisation will complete during initial construction of the \s-1BIO\s0. For
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some BIOs however, initialisation may not complete until after additional steps
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have occurred (for example through calling custom ctrls). The \fIBIO_get_init()\fR
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function returns the value of the \*(L"init\*(R" flag.
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.PP
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The \fIBIO_set_shutdown()\fR and \fIBIO_get_shutdown()\fR functions set and get the state of
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this \s-1BIO\s0's shutdown (i.e. \s-1BIO_CLOSE\s0) flag. If set then the underlying resource
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is also closed when the \s-1BIO\s0 is freed.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_get_data()\fR returns a pointer to the implementation specific custom data
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associated with this \s-1BIO\s0, or \s-1NULL\s0 if none has been set.
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.PP
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\&\fIBIO_get_init()\fR returns the state of the \s-1BIO\s0's init flag.
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.PP
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\&\fIBIO_get_shutdown()\fR returns the stat of the \s-1BIO\s0's shutdown (i.e. \s-1BIO_CLOSE\s0) flag.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbio\fR\|(7), \fIBIO_meth_new\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The functions described here were added in OpenSSL 1.1.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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