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RedHat 9 (Linux i386) - man page for tty (redhat section 4)

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TTY(4)				    Linux Programmer's Manual				   TTY(4)

       tty - controlling terminal

       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 fol-
       lowing ioctl() request is supported:

	      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.


       mknod(1), chown(1), getty(1), termios(3), console(4), ttys(4)

Linux					    1992-01-21					   TTY(4)
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