NAME
vhangup - virtually "hangup" the current control terminal

SYNOPSIS
void vhangup()

DESCRIPTION
Vhangup is used by the initialization process init(8) (among
others) to arrange that users are given "clean"’ terminals at
login, by revoking access of the previous users’ processes to the
terminal. To effect this, vhangup searches the system tables for
references to the control 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.