Linux cli command tty

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command tty and provides detailed information about the command tty, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the tty.

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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)

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