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SSL_PENDING(3) Library Functions Manual SSL_PENDING(3)

SSL_pendingobtain number of readable bytes buffered in an SSL object

#include <openssl/ssl.h>

int
SSL_pending(const SSL *ssl);

Data is received in whole blocks known as records from the peer. A whole record is processed, for example decrypted, in one go and is buffered until it is read by the application via a call to SSL_read(3).

SSL_pending() returns the number of bytes of application data which are available for immediate read.

SSL_pending() takes into account only bytes from the TLS/SSL record that is currently being processed (if any).

SSL_pending() returns the number of buffered and processed application data bytes that are pending and are available for immediate read.

ssl(3), SSL_read(3)

SSL_pending() appeared in SSLeay 0.4 or earlier and has been available since OpenBSD 2.4.

Up to OpenSSL 0.9.6, SSL_pending() did not check if the record type of pending data is application data.

January 23, 2020 OpenBSD-current