ttymon login

Beside getty login, SVR4 also supports another login via ttymon. Typically getty login is used for console and ttymon login is used for terminal. In ttymon login, init fork-exec program sac (sevice access controller). sac fork-exec ttymon when system enters multiuser state. ttymon monitors all terminal ports listed in the configuration file. When user logs in, ttymon fork-exec program login. Note that the parent of login is now ttymon while the parent for getty is init.