NAME    [Toc]    [Back]

       tty - controlling terminal

DESCRIPTION    [Toc]    [Back]

       The  file  /dev/tty  is	a character file with major number 5 and minor
       number 0, usually of mode 0666 and owner.group root.tty.  It is a  synonym
 for the controlling terminal of a process, if any.

       In  addition  to  the ioctl() requests supported by the device that tty
       refers to, the following ioctl() request is supported:

       TIOCNOTTY    [Toc]    [Back]
	      Detach the current process from its  controlling	terminal,  and
	      remove  it  from its current process group, without attaching it
	      to a new process group (that is, set its	process  group	ID  to
	      zero).   This  ioctl()  call only works on file descriptors connected
 to /dev/tty; this is used by daemon processes  when  they
	      are  invoked  by	a user at a terminal.  The process attempts to
	      open /dev/tty; if the open succeeds, it detaches itself from the
	      terminal	by  using  TIOCNOTTY,  while  if the open fails, it is
	      obviously not attached to a terminal and does not need to detach
	      itself.

FILES    [Toc]    [Back]

       /dev/tty

SEE ALSO    [Toc]    [Back]

       mknod(1), chown(1), getty(1), termios(2), console(4), ttys(4)



Linux				  1992-01-21				TTY(4)