reassigning a control terminal

[Guy Harris]

> Is there any way to reassign the control terminal associated with a
> process that has been forked from a process to which a control ter-
> minal is associated?  That is, can I get a forked process to change
> the device associated with /dev/tty?  We are running 4.2bsd.

There is an (undocumented, mumble bitch grumble) "ioctl" call that permits a
process which has a control terminal to detach itself from that control
terminal.  You open "/dev/tty" (if it fails, there's no control terminal to
detach yourself from) and do a TIOCNOTTY "ioctl" call (it takes no
parameters).  The next terminal that process opens will become its control
terminal.

	Guy Harris