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Title "SSL_PENDING 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_pending, SSL_has_pending - check for readable bytes buffered in an SSL object Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& int SSL_pending(const SSL *ssl); int SSL_has_pending(const SSL *s); .Ve 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 SSL_read_ex\|(3) or SSL_read\|(3).

\fBSSL_pending() returns the number of bytes which have been processed, buffered and are available inside ssl for immediate read.

If the \s-1SSL\s0 object's read_ahead flag is set (see \fBSSL_CTX_set_read_ahead\|(3)), additional protocol bytes (beyond the current record) may have been read containing more \s-1TLS/SSL\s0 records. This also applies to \s-1DTLS\s0 and pipelining (see SSL_CTX_set_split_send_fragment\|(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 SSL_pending() will ignore them. Therefore, it is possible for no more bytes to be readable from the underlying \s-1BIO\s0 (because OpenSSL has already read them) and for SSL_pending() to return 0, even though readable application data bytes are available (because the data is in unprocessed buffered records).

\fBSSL_has_pending() returns 1 if s has buffered data (whether processed or unprocessed) and 0 otherwise. Note that it is possible for SSL_has_pending() to return 1, and then a subsequent call to SSL_read_ex() or SSL_read() 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 SSL_has_pending() to continue to return 1 even after an \fBSSL_read_ex() or SSL_read() call because the buffered and unprocessed data is not yet processable (e.g. because OpenSSL has only received a partial record so far).

Header "RETURN VALUES" \fBSSL_pending() returns the number of buffered and processed application data bytes that are pending and are available for immediate read. SSL_has_pending() returns 1 if there is buffered record data in the \s-1SSL\s0 object and 0 otherwise. Header "SEE ALSO" \fBSSL_read_ex\|(3), SSL_read\|(3), SSL_CTX_set_read_ahead\|(3), \fBSSL_CTX_set_split_send_fragment\|(3), ssl\|(7) Header "HISTORY" The SSL_has_pending() function was added in OpenSSL 1.1.0. Header "COPYRIGHT" Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 <https://www.openssl.org/source/license.html>.