vhangup - virtually ``hangup'' the current control terminal
Vhangup is used by the initialization process init(1M) (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 (EIO). Finally, a hangup
signal (SIGHUP) is sent to the process group of the control terminal.
Access to the control terminal via /dev/tty is still possible.
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