initis a thing of the past.
You've come to this page because you've said something similar to the following:
/etc/inittabcontains records instructing
initwaits for the login session to terminate and cleans up after it.
This is the Frequently Given Answer to such statements.
/etc/inittab is nowadays wholly a thing of the past, but this particular functionality of it has been obsolete in Unix since 1988.
That was when, with the advent of AT&T Unix System 5 Release 4, this functionality was taken out of
/etc/inittab and given to the new Service Access Facility.
init spawned the Service Access Controller, which spawned
ttymon the port monitor for terminal devices.
ttymon did all of the line discipline STREAMS module pushing, serial speed negotiation, and prompting, across one or more terminal devices; and handled updating the Unix login database.
It in turn spawned
getty was not in fact anywhere part of the process, its functionality subsumed by
getty was only the case for about half a decade and was obsolete years before Linux was even invented.
The so-called "sysvinit" for Linux is not actually AT&T System 5
init but a clone by Miquel van Smoorenburg, written for Minix in 1992.
Alas, xe did not clone the Service Access Facility of Release 4, or IBM's System Resource Controller (also pre-dating Linux) which similarly took much of the functionality out of
/etc/inittab inclunding run-levels, making them obsolete by 1990.
Solaris and its heirs such as OpenIndiana, SmartOS, Illumos, and Schillix all still have
The nosh service management toolset does not employ
getty at all for kernel virtual terminals and user-space virtual terminals, its functionality having similarly been replaced by some simple chain-loading tools that do the only parts of
getty that are actually relevant to virtual terminals (which do not have serial port speeds to negotiate in the first place, for example).
For real terminals, it runs
getty programs, but as with the SAF they are not spawned by process 1.
Process 1 is the system manager, which is not responsible for any TUI login services.
getty processes for real terminal TUI login services are spawned by a subordinate service manager process.
See the "Terminals" chapter of the nosh Guide for more information.
systemd does not use
/etc/inittab but still uses
getty (more specifically, Wietse Venema's
agetty clone) for both kernel virtual terminals and real terminals, they are still spawned old-style by process 1, which also still does login accounting.
Of course, the BSD side of the universe never had
/etc/inittab, but it did and still does have
getty processes spawned from
init per the configuration in
However, the login database does not have the notion of "init" or "getty" states for terminals, and
init does no login accounting at session termination.
Login accounting is done by the
pam_unix PAM, with the
login program itself doing the cleanup at log-off.