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
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 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 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.
SEE ALSO
chown(1), mknod(1), ioctl(2), termios(3), console(4), ttyS(4), mingetty(8)
Copyright (c) 1993 Michael Haardt (michael@moria.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 (faith@cs.unc.edu)
Modified 2003-04-07 by Michael Kerrisk
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