SSL_pendingSection: OpenSSL (3)
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NAMESSL_pending - obtain number of readable bytes buffered in an SSL object
int SSL_pending(const SSL *ssl);
DESCRIPTIONSSL_pending() returns the number of bytes which are available inside ssl for immediate read.
NOTESData are received in blocks from the peer. Therefore data can be buffered inside ssl and are ready for immediate retrieval with SSL_read(3).
RETURN VALUESThe number of bytes pending is returned.
BUGSSSL_pending() takes into account only bytes from the TLS/SSL record that is currently being processed (if any). If the SSL object's read_ahead flag is set, additional protocol bytes may have been read containing more TLS/SSL records; these are ignored by SSL_pending().
SEE ALSOSSL_read(3), ssl(3)