freebsd stable - Oct 2008 - Where is new session creation in init-getty-login

I can`t find the place in  the source where new session creates when I login via
local terminal.
There 
 is no call to setsid() after init forks in start_getty(session_t *sp) and no
calls to that
function in 
 getty and login. But when I login to the local terminal, exit and login again I
will have
different 
 session ID`s (pid numbers of session leader process). So I wan`t to know where
login process
become a 
 session leader?
 
 Mihail.

On Wed, Oct 29, 2008 at 07:26:50PM +0300, ?????? ????
wrote:
> 
> I can`t find the place in the source where new session creates when
> I login via local terminal. There is no call to setsid() after init
> forks in start_getty(session_t *sp) and no calls to that function in
> getty and login. But when I login to the local terminal, exit and
> login again I will have different session ID`s (pid numbers of session
> leader process). So I wan`t to know where login process become a
> session leader?
Watch for the login_tty(3) calls both in init and in getty. This function
from libutil sets up the session and controlling terminal. It is called
from init for single-user shell and rc script. getty calls it for
line logons.
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