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TTY(4) Linux Programmer's Manual TTY(4)
NAME
tty - controlling terminal
DESCRIPTION
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 syn-
onym for the controlling terminal of a process, if any.
In addition to the ioctl() requests supported by the device that tty
refers to, the ioctl() request TIOCNOTTY is supported.
TIOCNOTTY
Detach the current 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 cur-
rent session lose their controlling tty.
This ioctl() 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.
FILES
/dev/tty
SEE ALSO
chown(1), getty(1), mknod(1), ioctl(2), termios(3), console(4), ttyS(4)
Linux 2003-04-07 TTY(4)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Sat Sep 8 16:39:46 GMT 2007
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