vhangup — virtually hangup the current terminal
vhangup() simulates a hangup
on the current terminal. This call arranges for other users
to have a “clean” terminal at login
On success, zero is returned. On error, −1 is
errno is set
The calling process has insufficient privilege to
capability is required.
This call is Linux-specific, and should not be used in programs intended to be portable.
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Copyright 1993 Rickard E. Faith (faithcs.unc.edu)
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Modified, 27 May 2004, Michael Kerrisk <mtk.manpagesgmail.com>
Added notes on capability requirements