Manpage of TTY

TTY

Section: Linux Programmer's Manual (4)
Updated: 2003-04-07
Index
 

NAME

tty - controlling terminal  

DESCRIPTION

The file /dev/ttyis 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 ttyrefers to, the ioctl(2) request TIOCNOTTYis supported.  

TIOCNOTTY

Detach the calling process from its controlling terminal.

If the process is the session leader, then SIGHUPand SIGCONTsignals 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), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8)


 

Index

NAME
DESCRIPTION
TIOCNOTTY
FILES
SEE ALSO

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