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Linux 2.6 - man page for tty (linux section 4)

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

NAME
       tty - controlling terminal

DESCRIPTION
       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(2)	requests  supported by the device that tty refers to, the
       ioctl(2) request TIOCNOTTY is supported.

   TIOCNOTTY
       Detach the calling process from its controlling terminal.

       If the process is the session leader, then SIGHUP and SIGCONT  signals  are  sent  to  the
       foreground  process  group and all processes in the current session lose their controlling
       tty.

       This ioctl(2) call works only on file descriptors connected to /dev/tty.  It  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  TIOC-
       NOTTY,  while  if  the open fails, it is obviously not attached to a terminal and does not
       need to detach itself.

FILES
       /dev/tty

SEE ALSO
       chown(1), mknod(1), ioctl(2), termios(3), console(4),  tty_ioctl(4),  ttyS(4),  agetty(8),
       mingetty(8)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2003-04-07					   TTY(4)


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