192 lines
6.7 KiB
Groff
Executable File
192 lines
6.7 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "SSL_PENDING 3"
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.TH SSL_PENDING 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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SSL_pending, SSL_has_pending \- check for readable bytes buffered in an
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SSL object
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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/ssl.h>
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\&
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\& int SSL_pending(const SSL *ssl);
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\& int SSL_has_pending(const SSL *s);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Data is received in whole blocks known as records from the peer. A whole record
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is processed (e.g. decrypted) in one go and is buffered by OpenSSL until it is
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read by the application via a call to \fISSL_read_ex\fR\|(3) or \fISSL_read\fR\|(3).
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.PP
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\&\fISSL_pending()\fR returns the number of bytes which have been processed, buffered
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and are available inside \fBssl\fR for immediate read.
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.PP
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If the \fB\s-1SSL\s0\fR object's \fIread_ahead\fR flag is set (see
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\&\fISSL_CTX_set_read_ahead\fR\|(3)), additional protocol bytes (beyond the current
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record) may have been read containing more \s-1TLS/SSL\s0 records. This also applies to
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\&\s-1DTLS\s0 and pipelining (see \fISSL_CTX_set_split_send_fragment\fR\|(3)). These
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additional bytes will be buffered by OpenSSL but will remain unprocessed until
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they are needed. As these bytes are still in an unprocessed state \fISSL_pending()\fR
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will ignore them. Therefore it is possible for no more bytes to be readable from
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the underlying \s-1BIO\s0 (because OpenSSL has already read them) and for \fISSL_pending()\fR
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to return 0, even though readable application data bytes are available (because
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the data is in unprocessed buffered records).
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.PP
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\&\fISSL_has_pending()\fR returns 1 if \fBs\fR has buffered data (whether processed or
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unprocessed) and 0 otherwise. Note that it is possible for \fISSL_has_pending()\fR to
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return 1, and then a subsequent call to \fISSL_read_ex()\fR or \fISSL_read()\fR to return no
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data because the unprocessed buffered data when processed yielded no application
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data (for example this can happen during renegotiation). It is also possible in
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this scenario for \fISSL_has_pending()\fR to continue to return 1 even after an
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\&\fISSL_read_ex()\fR or \fISSL_read()\fR call because the buffered and unprocessed data is
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not yet processable (e.g. because OpenSSL has only received a partial record so
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far).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_pending()\fR returns the number of buffered and processed application data
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bytes that are pending and are available for immediate read. \fISSL_has_pending()\fR
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returns 1 if there is buffered record data in the \s-1SSL\s0 object and 0 otherwise.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fISSL_read_ex\fR\|(3), \fISSL_read\fR\|(3), \fISSL_CTX_set_read_ahead\fR\|(3),
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\&\fISSL_CTX_set_split_send_fragment\fR\|(3), \fIssl\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fISSL_has_pending()\fR function was added in OpenSSL 1.1.0.
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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 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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