|| Linux Programmer's Manual
NAME tty - controlling terminal
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
signals are sent to the foreground process group and all processes in the current session lose their controlling tty.
(2) call works only on file descriptors connected to
. It is used by daemon processes when they are invoked by a user at a terminal. The process attempts to open
. If the open succeeds, it detaches itself from the terminal by using
, while if the open fails, it is obviously not attached to a terminal and does not need to detach itself.
COLOPHON This page is part of release 3.53 of the Linux
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