gnutls_record_set_max_size man page

gnutls_record_set_max_size — API function


#include <gnutls/gnutls.h>

ssize_t gnutls_record_set_max_size(gnutls_session_t session, size_t size);


gnutls_session_t session

is a gnutls_session_t type.

size_t size

is the new size


This function sets the maximum record packet size in this connection.  This property can only be set to clients.  The server may choose not to accept the requested size.

Acceptable values are 512(=2^9), 1024(=2^10), 2048(=2^11) and 4096(=2^12).  The requested record size does get in effect immediately only while sending data. The receive part will take effect after a successful handshake.

This function uses a TLS extension called 'max record size'.  Not all TLS implementations use or even understand this extension.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.

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See Also

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3.6.2 gnutls