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NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON |
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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 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.
/dev/tty
chown(1), mknod(1), ioctl(2), ioctl_console(2), ioctl_tty(2),
termios(3), ttyS(4), vcs(4), pty(7), agetty(8), mingetty(8)
This page is part of release 5.13 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 2019-03-06 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)
Copyright and license for this manual page
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