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 “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 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. 

4th Berkeley Distribution  —  %W%%Q%%Y%