pty和TTY有何区别?什么意思
说用户从TTY/2端口登陆,有什么用?这是什么端口,有一些详细的解释吗?控制终端”,具体是什么意思?
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 following ioctl() request is supported:
TIOCNOTTY
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 con-
nected 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
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