Copyright (c) 1980 Regents of the University of California.
All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.
@(#)vhangup.2 4.1 (Berkeley) 05/09/85
All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.
@(#)vhangup.2 4.1 (Berkeley) 05/09/85
VHANGUP 2V
C 4 NAME
vhangup - virtually ``hangup'' the current control terminal
SYNOPSIS
vhangup() DESCRIPTION
Vhangup is used by the initialization process
init (8) to arrange that users are given \*(lqclean\*(rq' 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 which 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 is peculiar to this version of UNIX. The options and specifications of this system call and even the call itself are subject to change.