forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
264 lines
9.7 KiB
Groff
264 lines
9.7 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BIO_CTRL 3"
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.TH BIO_CTRL 3 "2020-04-21" "1.1.1g" "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_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 \&\- BIO control operations
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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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\& typedef int BIO_info_cb(BIO *b, int state, int res);
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\&
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\& long BIO_ctrl(BIO *bp, int cmd, long larg, void *parg);
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\& long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *cb);
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\& char *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
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\& long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
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\&
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\& int BIO_reset(BIO *b);
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\& int BIO_seek(BIO *b, int ofs);
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\& int BIO_tell(BIO *b);
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\& int BIO_flush(BIO *b);
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\& int BIO_eof(BIO *b);
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\& int BIO_set_close(BIO *b, long flag);
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\& int BIO_get_close(BIO *b);
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\& int BIO_pending(BIO *b);
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\& int BIO_wpending(BIO *b);
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\& size_t BIO_ctrl_pending(BIO *b);
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\& size_t BIO_ctrl_wpending(BIO *b);
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\&
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\& int BIO_get_info_callback(BIO *b, BIO_info_cb **cbp);
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\& int BIO_set_info_callback(BIO *b, BIO_info_cb *cb);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBBIO_ctrl()\fR, \fBBIO_callback_ctrl()\fR, \fBBIO_ptr_ctrl()\fR and \fBBIO_int_ctrl()\fR
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are \s-1BIO\s0 \*(L"control\*(R" operations taking arguments of various types.
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These functions are not normally called directly, various macros
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are used instead. The standard macros are described below, macros
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specific to a particular type of \s-1BIO\s0 are described in the specific
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BIOs manual page as well as any special features of the standard
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calls.
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.PP
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\&\fBBIO_reset()\fR typically resets a \s-1BIO\s0 to some initial state, in the case
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of file related BIOs for example it rewinds the file pointer to the
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start of the file.
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.PP
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\&\fBBIO_seek()\fR resets a file related \s-1BIO\s0's (that is file descriptor and
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\&\s-1FILE\s0 BIOs) file position pointer to \fBofs\fR bytes from start of file.
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.PP
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\&\fBBIO_tell()\fR returns the current file position of a file related \s-1BIO.\s0
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.PP
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\&\fBBIO_flush()\fR normally writes out any internally buffered data, in some
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cases it is used to signal \s-1EOF\s0 and that no more data will be written.
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.PP
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\&\fBBIO_eof()\fR returns 1 if the \s-1BIO\s0 has read \s-1EOF,\s0 the precise meaning of
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\&\*(L"\s-1EOF\*(R"\s0 varies according to the \s-1BIO\s0 type.
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.PP
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\&\fBBIO_set_close()\fR sets the \s-1BIO\s0 \fBb\fR close flag to \fBflag\fR. \fBflag\fR can
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take the value \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE.\s0 Typically \s-1BIO_CLOSE\s0 is used
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in a source/sink \s-1BIO\s0 to indicate that the underlying I/O stream should
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be closed when the \s-1BIO\s0 is freed.
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.PP
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\&\fBBIO_get_close()\fR returns the BIOs close flag.
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.PP
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\&\fBBIO_pending()\fR, \fBBIO_ctrl_pending()\fR, \fBBIO_wpending()\fR and \fBBIO_ctrl_wpending()\fR
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return the number of pending characters in the BIOs read and write buffers.
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Not all BIOs support these calls. \fBBIO_ctrl_pending()\fR and \fBBIO_ctrl_wpending()\fR
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return a size_t type and are functions, \fBBIO_pending()\fR and \fBBIO_wpending()\fR are
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macros which call \fBBIO_ctrl()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBBIO_reset()\fR normally returns 1 for success and 0 or \-1 for failure. File
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BIOs are an exception, they return 0 for success and \-1 for failure.
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.PP
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\&\fBBIO_seek()\fR and \fBBIO_tell()\fR both return the current file position on success
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and \-1 for failure, except file BIOs which for \fBBIO_seek()\fR always return 0
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for success and \-1 for failure.
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.PP
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\&\fBBIO_flush()\fR returns 1 for success and 0 or \-1 for failure.
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.PP
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\&\fBBIO_eof()\fR returns 1 if \s-1EOF\s0 has been reached 0 otherwise.
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.PP
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\&\fBBIO_set_close()\fR always returns 1.
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.PP
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\&\fBBIO_get_close()\fR returns the close flag value: \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE.\s0
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.PP
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\&\fBBIO_pending()\fR, \fBBIO_ctrl_pending()\fR, \fBBIO_wpending()\fR and \fBBIO_ctrl_wpending()\fR
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return the amount of pending data.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fBBIO_flush()\fR, because it can write data may return 0 or \-1 indicating
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that the call should be retried later in a similar manner to \fBBIO_write_ex()\fR.
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The \fBBIO_should_retry()\fR call should be used and appropriate action taken
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is the call fails.
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.PP
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The return values of \fBBIO_pending()\fR and \fBBIO_wpending()\fR may not reliably
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determine the amount of pending data in all cases. For example in the
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case of a file \s-1BIO\s0 some data may be available in the \s-1FILE\s0 structures
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internal buffers but it is not possible to determine this in a
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portably way. For other types of \s-1BIO\s0 they may not be supported.
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.PP
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Filter BIOs if they do not internally handle a particular \fBBIO_ctrl()\fR
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operation usually pass the operation to the next \s-1BIO\s0 in the chain.
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This often means there is no need to locate the required \s-1BIO\s0 for
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a particular operation, it can be called on a chain and it will
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be automatically passed to the relevant \s-1BIO.\s0 However this can cause
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unexpected results: for example no current filter BIOs implement
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\&\fBBIO_seek()\fR, but this may still succeed if the chain ends in a \s-1FILE\s0
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or file descriptor \s-1BIO.\s0
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.PP
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Source/sink BIOs return an 0 if they do not recognize the \fBBIO_ctrl()\fR
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operation.
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.SH "BUGS"
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.IX Header "BUGS"
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Some of the return values are ambiguous and care should be taken. In
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particular a return value of 0 can be returned if an operation is not
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supported, if an error occurred, if \s-1EOF\s0 has not been reached and in
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the case of \fBBIO_seek()\fR on a file \s-1BIO\s0 for a successful operation.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (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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