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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 terminal. To effect this, vhangup() searches the system tables for
references to the controlling terminal of the invoking process and revokes access permis-
sions on each instance of the terminal that it finds. Further attempts to access the ter-
minal 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 5.11 19 Mar 1998 vhangup(2)
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