VHANGUP(2)VHANGUP(2)NAMEvhangup - virtually ``hangup'' the current control terminal
SYNOPSISvhangup()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)