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+.\"	$NetBSD: SSL_pending.3,v 1.5 2026/04/08 17:06:48 christos Exp $
+.\"
+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+.    ds C` ""
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+.el\{\
+.    ds C`
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+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+.    if \nF \{\
+.        de IX
+.        tm Index:\\$1\t\\n%\t"\\$2"
+..
+.        if !\nF==2 \{\
+.            nr % 0
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+.\}
+.rr rF
+.\"
+.\" Required to disable full justification in groff 1.23.0.
+.if n .ds AD l
+.\" ========================================================================
+.\"
+.IX Title "SSL_pending 3"
+.TH SSL_pending 3 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+SSL_pending, SSL_has_pending \- check for readable bytes buffered in an
+SSL object
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\&
+\& int SSL_pending(const SSL *ssl);
+\& int SSL_has_pending(const SSL *s);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+Data is received in whole blocks known as records from the peer. A whole record
+is processed (e.g. decrypted) in one go and is buffered by OpenSSL until it is
+read by the application via a call to \fBSSL_read_ex\fR\|(3) or \fBSSL_read\fR\|(3).
+.PP
+\&\fBSSL_pending()\fR returns the number of bytes which have been processed, buffered
+and are available inside \fBssl\fR for immediate read.
+.PP
+If the \fBSSL\fR object\*(Aqs \fIread_ahead\fR flag is set (see
+\&\fBSSL_CTX_set_read_ahead\fR\|(3)), additional protocol bytes (beyond the current
+record) may have been read containing more TLS/SSL records. This also applies to
+DTLS and pipelining (see \fBSSL_CTX_set_split_send_fragment\fR\|(3)). These
+additional bytes will be buffered by OpenSSL but will remain unprocessed until
+they are needed. As these bytes are still in an unprocessed state \fBSSL_pending()\fR
+will ignore them. Therefore, it is possible for no more bytes to be readable from
+the underlying BIO (because OpenSSL has already read them) and for \fBSSL_pending()\fR
+to return 0, even though readable application data bytes are available (because
+the data is in unprocessed buffered records).
+.PP
+\&\fBSSL_has_pending()\fR returns 1 if \fBs\fR has buffered data (whether processed or
+unprocessed) and 0 otherwise. Note that it is possible for \fBSSL_has_pending()\fR to
+return 1, and then a subsequent call to \fBSSL_read_ex()\fR or \fBSSL_read()\fR to return no
+data because the unprocessed buffered data when processed yielded no application
+data (for example this can happen during renegotiation). It is also possible in
+this scenario for \fBSSL_has_pending()\fR to continue to return 1 even after an
+\&\fBSSL_read_ex()\fR or \fBSSL_read()\fR call because the buffered and unprocessed data is
+not yet processable (e.g. because OpenSSL has only received a partial record so
+far).
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBSSL_pending()\fR returns the number of buffered and processed application data
+bytes that are pending and are available for immediate read. \fBSSL_has_pending()\fR
+returns 1 if there is buffered record data in the SSL object and 0 otherwise.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBSSL_read_ex\fR\|(3), \fBSSL_read\fR\|(3), \fBSSL_CTX_set_read_ahead\fR\|(3),
+\&\fBSSL_CTX_set_split_send_fragment\fR\|(3), \fBssl\fR\|(7)
+.SH HISTORY
+.IX Header "HISTORY"
+The \fBSSL_has_pending()\fR function was added in OpenSSL 1.1.0.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.