-forks several times to create a process
-for each terminal specified in the file.
-Each of these processes opens the appropriate terminal
-for reading and writing. These channels thus
-receive file descriptors 0, 1 and 2, the standard input and
-output and the diagnostic output.
-Opening the terminal will usually involve a delay,
-since the
-.IR open ""
-is not completed until someone
-is dialed up and carrier established on the channel.
-If a terminal exists but an error occurs when trying to open the terminal
-.I init
-complains by writing a message to the system console;
-the message is repeated every 10 minutes for each such terminal
-until the terminal is shut off in /etc/ttys and init notified (by
-a hangup, as described below), or the terminal becomes accessible
-(init checks again every minute).
-After an open succeeds,
-.I /etc/getty
-is called with argument as specified by the second character of
-the
-.I ttys
-file line.