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.
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 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.
chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8)
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (c) 1993 Michael Haardt (michaelmoria.de), Fri Apr 2 11:32:09 MET DST 1993 This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. Modified 1993-07-24 by Rik Faith (faithcs.unc.edu) Modified 2003-04-07 by Michael Kerrisk |