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gnutls_transport_set_fastopen(3)    gnutls    gnutls_transport_set_fastopen(3)

NAME
       gnutls_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);

ARGUMENTS
       gnutls_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

DESCRIPTION
       Enables 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	speci-
       fied 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.

NOTE
       This  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.

SINCE
       3.5.3

REPORTING BUGS
       Report bugs to <bugs@gnutls.org>.
       Home page: http://www.gnutls.org

COPYRIGHT
       Copyright (C) 2001-2017 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 no-
       tice and	this notice are	preserved.

SEE ALSO
       The full	documentation for gnutls is maintained as  a  Texinfo  manual.
       If  the /usr/share/doc/gnutls/ directory	does not contain the HTML form
       visit

       http://www.gnutls.org/manual/

gnutls				    3.5.12    gnutls_transport_set_fastopen(3)

NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | NOTE | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO

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