mgetty is a modem-aware getty. It supports modems with the Hayes AT command set and is especially designed for supporting modems that are used to send faxes and to dial out as well as dial in. These features are not required for a serial console.
mgetty does not require the traditional /etc/gettydefs file. As a result mgetty is invoked from /etc/inittab without supplying an entry in /etc/gettydefs.
mgetty is configured using the file /etc/mgetty+sendfax/mgetty.config. It should contain an entry for the port used by the serial console.
Figure 6-8. mgetty configuration file mgetty.config
port ttyS0 speed 9600 direct yes data-only yes toggle-dtr yes need-dsr yes port-owner root port-group root port-mode 600 login-prompt @ \P login:\040 login-time 60 term vt102
All the options are documented in the PostScript file /usr/share/doc/mgetty…/mgetty.ps.
We set direct, data-only, need-dsr and toggle-dtr so that the RS-232 control lines are used correctly for a dumb modem.
port-owner, port-group and port-mode set the serial device to be accessible only by the root user. Modem applications, which normally use the uucp group, cannot now accidentally use the serial console.
login-prompt shows the machine (@) and serial port (\P) being used. The text \040 is simply the octal code for a space after login:.
term vt102 gives the make and model of the terminal most likely to dial in. This sets the TERM environment variable, which you can change if you are dialling in from another terminal type.
The remaining configuration files, /etc/mgetty+sendfax/dialin.config and /etc/mgetty+sendfax/login.config, do not need to be altered.
If you wish to alter the suggested configuration then note that mgetty's blocking and toggle-dtr parameters do not co-exist well.
If you have difficulties, activate debugging by adding debug 8 to mgetty.config. mgetty's actions are then visible in the file /var/log/mgetty.log.ttyS0.
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Created 1996-2023 by Maxim Chirkov
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