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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.
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.
/dev/tty
chown(1), mknod(1), ioctl(2), ioctl_console(2), ioctl_tty(2),
termios(3), ttyS(4), agetty(8), mingetty(8)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
Linux 2017-05-03 TTY(4)
Pages that refer to this page: setterm(1), tset(1), ioctl(2), ioctl_console(2), open(2), stdin(3), ttyS(4), vcs(4), pty(7), termio(7), pam_selinux(8)