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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  syn-
       onym 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 cur-
       rent 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 TIOCNOTTY,
       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 3.74 of the	Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2003-04-07				TTY(4)

NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON

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