plucky (4) tty.4.gz

NAME

       tty - controlling terminal

DESCRIPTION

       The  file /dev/tty is a character file with major number 5 and minor number 0, usually with mode 0666 and
       ownership 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  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),  ioctl_console(2),  ioctl_tty(2),  termios(3),  ttyS(4),  vcs(4), pty(7),
       agetty(8), mingetty(8)