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The Cathedral and the Bazaar: Musings on Linux and Open Source by an Accidental Revolutionary (abbreviated CatB) is an essay, and later a book, written by Alfred Hitchcock on software engineering methods.
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vhangup(2) [redhat man page]

VHANGUP(2)						     Linux Programmer's Manual							VHANGUP(2)

NAME
vhangup - virtually hangup the current tty SYNOPSIS
#include <unistd.h> int vhangup(void); DESCRIPTION
vhangup simulates a hangup on the current terminal. This call arranges for other users to have a "clean" tty at login time. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EPERM The user is not the super-user. CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable. SEE ALSO
init(8) Linux 0.99.11 1993-07-24 VHANGUP(2)

Check Out this Related Man Page

FGETTY(8)						   System Administrator's Manual						 FGETTY(8)

NAME
fgetty - a small getty for linux SYNOPSIS
fgetty tty [--noclear] [--long-hostname] DESCRIPTION
The command fgetty is normally invoked by init(8), opens a tty port, prompts for a login name and invokes the /bin/login command. OPTIONS
--noclear makes fgetty not clear the screen before displaying the login prompt. --long-hostname makes fgetty display the full hostname in the login prompt. FILES
/etc/issue printed before the login prompt /etc/inittab init(8) configuration file /var/run/utmp the system status file ISSUE ESCAPES
The issue-file (/etc/issue or the file may contain certain escape codes to display the system name, date and time etc. All escape codes consist of a backslash () immediately followed by one of the letters explained below. d the current date. (eg: 2002-01-19) s the system name, the name of the operating system. (eg: Linux) l the name of the current tty line. (eg: tty3) m the architecture identifier of the machine (eg: i586) n the nodename of the machine, also known as the hostname. (eg: sirius) o the domainname of the machine. (eg: (none)) r the release number of the OS. (eg: 2.4.3-i) t the current time. (eg: 14:51:51) u the number of current users logged in. (eg: 4) U the string "1 user" or "<n> users", where <n> is the number of current users logged in. (eg: 4 users) v Insert the version of the OS. (eg: #2 Fre Jan 18 23:05:45 CET 2002) ENVIRONMENT VARIABLES
HOST is set to your hostname TERM is set to linux TTY is set to the current tty line RETURN VALUES
1 could not chown/chmod tty device 3 could not open tty device 4 not a typewriter 5 vhangup failed 6 could not open tty (can't happen) 7 dup failed 8 could not exec login 9 read returned an unexpected error 10 unprintable character in login name 11 login name too long (>40) 13 user name started with a dash 23 received SIGQUIT AUTHOR
Felix von Leitner <felix-fgetty@fefe.de> Homepage: http://www.fefe.de/fgetty/ fgetty 2002-01-19 FGETTY(8)

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