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.IX Title &quot;BIO_CTRL 3&quot;
.TH BIO_CTRL 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.nh
.SH &quot;NAME&quot;
BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl, BIO_reset, BIO_seek, BIO_tell, BIO_flush, BIO_eof, BIO_set_close, BIO_get_close, BIO_pending, BIO_wpending, BIO_ctrl_pending, BIO_ctrl_wpending, BIO_get_info_callback, BIO_set_info_callback, BIO_info_cb \&amp;\- BIO control operations
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/bio.h&gt;
\&amp;
\&amp; typedef int BIO_info_cb(BIO *b, int state, int res);
\&amp;
\&amp; long BIO_ctrl(BIO *bp, int cmd, long larg, void *parg);
\&amp; long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *cb);
\&amp; void *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
\&amp; long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
\&amp;
\&amp; int BIO_reset(BIO *b);
\&amp; int BIO_seek(BIO *b, int ofs);
\&amp; int BIO_tell(BIO *b);
\&amp; int BIO_flush(BIO *b);
\&amp; int BIO_eof(BIO *b);
\&amp; int BIO_set_close(BIO *b, long flag);
\&amp; int BIO_get_close(BIO *b);
\&amp; int BIO_pending(BIO *b);
\&amp; int BIO_wpending(BIO *b);
\&amp; size_t BIO_ctrl_pending(BIO *b);
\&amp; size_t BIO_ctrl_wpending(BIO *b);
\&amp;
\&amp; int BIO_get_info_callback(BIO *b, BIO_info_cb **cbp);
\&amp; int BIO_set_info_callback(BIO *b, BIO_info_cb *cb);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fIBIO_ctrl()\fR, \fIBIO_callback_ctrl()\fR, \fIBIO_ptr_ctrl()\fR and \fIBIO_int_ctrl()\fR
are \s-1BIO \s0\*(L&quot;control\*(R&quot; operations taking arguments of various types.
These functions are not normally called directly, various macros
are used instead. The standard macros are described below, macros
specific to a particular type of \s-1BIO\s0 are described in the specific
BIOs manual page as well as any special features of the standard
calls.
.PP
\&amp;\fIBIO_reset()\fR typically resets a \s-1BIO\s0 to some initial state, in the case
of file related BIOs for example it rewinds the file pointer to the
start of the file.
.PP
\&amp;\fIBIO_seek()\fR resets a file related \s-1BIO\s0's (that is file descriptor and
\&amp;\s-1FILE\s0 BIOs) file position pointer to \fBofs\fR bytes from start of file.
.PP
\&amp;\fIBIO_tell()\fR returns the current file position of a file related \s-1BIO.\s0
.PP
\&amp;\fIBIO_flush()\fR normally writes out any internally buffered data, in some
cases it is used to signal \s-1EOF\s0 and that no more data will be written.
.PP
\&amp;\fIBIO_eof()\fR returns 1 if the \s-1BIO\s0 has read \s-1EOF,\s0 the precise meaning of
\&amp;\*(L&quot;\s-1EOF\*(R&quot;\s0 varies according to the \s-1BIO\s0 type.
.PP
\&amp;\fIBIO_set_close()\fR sets the \s-1BIO \s0\fBb\fR close flag to \fBflag\fR. \fBflag\fR can
take the value \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE.\s0 Typically \s-1BIO_CLOSE\s0 is used
in a source/sink \s-1BIO\s0 to indicate that the underlying I/O stream should
be closed when the \s-1BIO\s0 is freed.
.PP
\&amp;\fIBIO_get_close()\fR returns the BIOs close flag.
.PP
\&amp;\fIBIO_pending()\fR, \fIBIO_ctrl_pending()\fR, \fIBIO_wpending()\fR and \fIBIO_ctrl_wpending()\fR
return the number of pending characters in the BIOs read and write buffers.
Not all BIOs support these calls. \fIBIO_ctrl_pending()\fR and \fIBIO_ctrl_wpending()\fR
return a size_t type and are functions, \fIBIO_pending()\fR and \fIBIO_wpending()\fR are
macros which call \fIBIO_ctrl()\fR.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fIBIO_reset()\fR normally returns 1 for success and 0 or \-1 for failure. File
BIOs are an exception, they return 0 for success and \-1 for failure.
.PP
\&amp;\fIBIO_seek()\fR and \fIBIO_tell()\fR both return the current file position on success
and \-1 for failure, except file BIOs which for \fIBIO_seek()\fR always return 0
for success and \-1 for failure.
.PP
\&amp;\fIBIO_flush()\fR returns 1 for success and 0 or \-1 for failure.
.PP
\&amp;\fIBIO_eof()\fR returns 1 if \s-1EOF\s0 has been reached 0 otherwise.
.PP
\&amp;\fIBIO_set_close()\fR always returns 1.
.PP
\&amp;\fIBIO_get_close()\fR returns the close flag value: \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE.\s0
.PP
\&amp;\fIBIO_pending()\fR, \fIBIO_ctrl_pending()\fR, \fIBIO_wpending()\fR and \fIBIO_ctrl_wpending()\fR
return the amount of pending data.
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
\&amp;\fIBIO_flush()\fR, because it can write data may return 0 or \-1 indicating
that the call should be retried later in a similar manner to \fIBIO_write_ex()\fR.
The \fIBIO_should_retry()\fR call should be used and appropriate action taken
is the call fails.
.PP
The return values of \fIBIO_pending()\fR and \fIBIO_wpending()\fR may not reliably
determine the amount of pending data in all cases. For example in the
case of a file \s-1BIO\s0 some data may be available in the \s-1FILE\s0 structures
internal buffers but it is not possible to determine this in a
portably way. For other types of \s-1BIO\s0 they may not be supported.
.PP
Filter BIOs if they do not internally handle a particular \fIBIO_ctrl()\fR
operation usually pass the operation to the next \s-1BIO\s0 in the chain.
This often means there is no need to locate the required \s-1BIO\s0 for
a particular operation, it can be called on a chain and it will
be automatically passed to the relevant \s-1BIO.\s0 However, this can cause
unexpected results: for example no current filter BIOs implement
\&amp;\fIBIO_seek()\fR, but this may still succeed if the chain ends in a \s-1FILE\s0
or file descriptor \s-1BIO.\s0
.PP
Source/sink BIOs return an 0 if they do not recognize the \fIBIO_ctrl()\fR
operation.
.SH &quot;BUGS&quot;
.IX Header &quot;BUGS&quot;
Some of the return values are ambiguous and care should be taken. In
particular a return value of 0 can be returned if an operation is not
supported, if an error occurred, if \s-1EOF\s0 has not been reached and in
the case of \fIBIO_seek()\fR on a file \s-1BIO\s0 for a successful operation.
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  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
&lt;https://www.openssl.org/source/license.html&gt;.
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