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BSD 2.11 - man page for vhangup (bsd section 2)

VHANGUP(2)					 System Calls Manual					   VHANGUP(2)

NAME
vhangup - virtually ``hangup'' the current control terminal
SYNOPSIS
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. 4th Berkeley Distribution June 30, 1985 VHANGUP(2)


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