NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON
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(2) requests supported by the device that tty refers
to, the ioctl(2) request TIOCNOTTY is supported.
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 only works 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.
/dev/tty
chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4),
agetty(8), mingetty(8)
This page is part of release 3.23 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)