VHANGUP(2)							    VHANGUP(2)

NAME    [Toc]    [Back]

     vhangup - virtually ``hangup'' the	current	control	terminal

SYNOPSIS    [Toc]    [Back]

     vhangup()

DESCRIPTION    [Toc]    [Back]

     Vhangup is	used by	the initialization process init(1M) (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 (EIO).  Finally, a hangup
     signal (SIGHUP) is	sent to	the process group of the control terminal.

SEE ALSO    [Toc]    [Back]

     init (1M)

BUGS    [Toc]    [Back]

     Access to the control terminal via	/dev/tty is still possible.


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