vhangup(2) -- Linux man page
NAMEvhangup - virtually hangup the current tty
DESCRIPTIONvhangup simulates a hangup on the current terminal. This call arranges for other users to have a ``clean'' tty at login time.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
- The user is not the super-user.
CONFORMING TOThis call is Linux-specific, and should not be used in programs intended to be portable.