The function
login_tty ();
prepares a terminal for a new login session.
The file descriptor
fd
passed to
login_tty ();
must be opened for reading and writing on a terminal device.
It will be
made the controlling terminal for the calling process, after allocating
a new session with
setsid(2).
This terminal device will also be made the standard input, standard output,
and standard error output of the calling process.
RETURN VALUES
The
login_tty ();
function returns -1 if it could not make the device referenced by
fd
the controlling terminal of the calling process, and 0 otherwise.
