gnutls_transport_set_fastopen - Online Linux Manual PageSection : 3
Updated : 3.7.3
Source : gnutls
Note : gnutls
NAMEgnutls_transport_set_fastopen − API function
SYNOPSIS#include <gnutls/socket.h> void gnutls_transport_set_fastopen(gnutls_session_t session, int fd, struct sockaddr * connect_addr, socklen_t connect_addrlen, unsigned int flags);
ARGUMENTSgnutls_session_t session is a gnutls_session_t type. int fd is the session's socket descriptor struct sockaddr * connect_addr is the address we want to connect to socklen_t connect_addrlen is the length of connect_addr unsigned int flags must be zero
DESCRIPTIONEnables TCP Fast Open (TFO) for the specified TLS client session. That means that TCP connection establishment and the transmission of the first TLS client hello packet are combined. The peer's address must be specified in connect_addr and connect_addrlen , and the socket specified by fd should not be connected. TFO only works for TCP sockets of type AF_INET and AF_INET6. If the OS doesn't support TCP fast open this function will result to gnutls using connect() transparently during the first write.
NOTEThis function overrides all the transport callback functions. If this is undesirable, TCP Fast Open must be implemented on the user callback functions without calling this function. When using this function, transport callbacks must not be set, and gnutls_transport_set_ptr() or gnutls_transport_set_int() must not be called. On GNU/Linux TFO has to be enabled at the system layer, that is in /proc/sys/net/ipv4/tcp_fastopen, bit 0 has to be set. This function has no effect on server sessions.
SINCE3.5.3
REPORTING BUGSReport bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
COPYRIGHTCopyright © 2001- Free Software Foundation, Inc., and others.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.
SEE ALSOThe full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit https://www.gnutls.org/manual/ 0
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