BSD 2.11 - man page for vhangup (bsd section 2)
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vhangup - virtually ``hangup'' the current control terminal
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 pro-
cesses will yield i/o errors (EBADF). 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.
This call should be replaced by an automatic mechanism that takes place on process exit.
4th Berkeley Distribution June 30, 1985 VHANGUP(2)
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