TTY (4)
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() requests supported by the device that
tty refers to, the following ioctl() request is supported:
Detach the current process from its controlling terminal, and remove it
from its current process group, without attaching it to a new process
group (that is, set its process group ID to zero). This ioctl()
call only works on file descriptors connected to /dev/tty; this 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.
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SEE ALSO
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