vhangup(2) — bsd

VHANGUP(2)                           BSD                            VHANGUP(2)



NAME
     vhangup - virtually "hang up" the current control terminal

SYNOPSIS
     vhangup()

DESCRIPTION
     vhangup is used by the initialization process init(8) (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 (EBADF).  Finally, a hang-up
     signal (SIGHUP) is sent to the process group of the control terminal.

SEE ALSO
     init (8)

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

     This call should be replaced by an automatic mechanism that takes place
     on process exit.
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