SSL_CTX_set_read_ahead.3ssl man page

SSL_CTX_set_read_ahead, SSL_CTX_set_default_read_ahead, SSL_CTX_get_read_ahead, SSL_CTX_get_default_read_ahead, SSL_set_read_ahead, SSL_get_read_ahead ā€” manage whether to read as many input bytes as possible


 #include <openssl/ssl.h>

 int SSL_get_read_ahead(const SSL *s);
 void SSL_set_read_ahead(SSL *s, int yes);

 #define SSL_CTX_get_default_read_ahead(ctx)
 #define SSL_CTX_set_default_read_ahead(ctx,m)
 #define SSL_CTX_get_read_ahead(ctx)
 #define SSL_CTX_set_read_ahead(ctx,m)


SSL_CTX_set_read_ahead() and SSL_set_read_ahead() set whether we should read as many input bytes as possible (for non-blocking reads) or not. For example if x bytes are currently required by OpenSSL, but y bytes are available from the underlying BIO (where y > x), then OpenSSL will read all y bytes into its buffer (providing that the buffer is large enough) if reading ahead is on, or x bytes otherwise. The parameter yes or m should be 0 to ensure reading ahead is off, or non zero otherwise.

SSL_CTX_set_default_read_ahead is a synonym for SSL_CTX_set_read_ahead, and SSL_CTX_get_default_read_ahead is a synonym for SSL_CTX_get_read_ahead.

SSL_CTX_get_read_ahead() and SSL_get_read_ahead() indicate whether reading ahead has been set or not.


These functions have no impact when used with DTLS. The return values for SSL_CTX_get_read_head() and SSL_get_read_ahead() are undefined for DTLS.

Return Values

SSL_get_read_ahead and SSL_CTX_get_read_ahead return 0 if reading ahead is off, and non zero otherwise.

See Also


Referenced By

ssl.3ssl(3), SSL_CTX_set_split_send_fragment.3ssl(3), SSL_pending.3ssl(3).

2016-09-26 1.0.2j OpenSSL