vhangup(2) System Calls vhangup(2)
vhangup - virtually "hangup" the current controlling terminal
The vhangup() function is used by the initialization process init(1M)
(among others) to ensure that users are given "clean" terminals at
login by revoking access of the previous users' processes to the termi-
nal. To effect this, vhangup() searches the system tables for refer-
ences to the controlling terminal of the invoking process and revokes
access permissions on each instance of the terminal that it finds. Fur-
ther attempts to access the terminal by the affected processes will
yield I/O errors (EBADF or EIO). A SIGHUP (hangup signal) is sent to
the process group of the controlling terminal.
Access to the controlling terminal using /dev/tty is still possible.
This call should be replaced by an automatic mechanism that takes place
on process exit.
SunOS 5.10 19 Mar 1998 vhangup(2)