@deftypefun {void} {gnutls_transport_set_push_function} (gnutls_session_t @var{session}, gnutls_push_func @var{push_func})

@var{session}: is a @code{gnutls_session_t}  type.

@var{push_func}: a callback function similar to @code{write()} 

This is the function where you set a push function for gnutls to

use in order to send data.  If you are going to use berkeley style

sockets, you do not need to use this function since the default

send(2) will probably be ok.  Otherwise you should specify this

function for gnutls to be able to send data.

The callback should return a positive number indicating the

bytes sent, and -1 on error.

 @code{push_func} is of the form,

ssize_t (*gnutls_push_func)(gnutls_transport_ptr_t, const void*, size_t);

@end deftypefun