VHANGUP(2) System Calls Manual VHANGUP(2)
NAME
vhangup - virtually ``hangup'' the current control terminal
SYNOPSIS
vhangup()
DESCRIPTION
Vhangup is used by the initialization process init(8) (among others) to arrange that users are given "clean"' terminals at login, by revok-
ing access of the previous users' processes to the terminal. To effect this, vhangup searches the system tables for references to the con-
trol terminal of the invoking process, revoking access permissions on each instance of the terminal that it finds. Further attempts to
access the terminal by the affected processes will yield i/o errors (EBADF). Finally, a hangup signal (SIGHUP) is sent to the process
group of the control terminal.
SEE ALSO
init (8)
BUGS
Access to the control terminal via /dev/tty is still possible.
This call should be replaced by an automatic mechanism that takes place on process exit.
4th Berkeley Distribution June 30, 1985 VHANGUP(2)
