OPEN_INIT_PTY(8) NSA OPEN_INIT_PTY(8)NAME
open_init_pty - run an program under a pseudo terminal
SYNOPSIS
open_init_pty SCRIPT [[ARGS]...]
DESCRIPTION
Run a program under a pseudo terminal. This is used by run_init to run actually run the program after setting up the proper context. This
program acquires a new Pseudo terminal, forks a child process that binds to the pseudo terminal, and then sits around and connects the
physical terminal it was invoked upon with the pseudo terminal, passing keyboard input into to the child process, and passing the output of
the child process to the physical terminal.
It sets up the pseudo terminal properly based on the physical terminal attributes, and then sets the user's terminal to RAW mode, taking
care to reset it on exit.
AUTHOR
This manual page was written by Manoj Srivastava <srivasta@debian.org>, for the Debian GNU/Linux system.
Security Enhanced Linux January 2005 OPEN_INIT_PTY(8)
Check Out this Related Man Page
PTS(4) Linux Programmer's Manual PTS(4)NAME
ptmx, pts - pseudo-terminal master and slave
DESCRIPTION
The file /dev/ptmx is a character file with major number 5 and minor number 2, usually of mode 0666 and owner.group of root.root. It is
used to create a pseudo-terminal master and slave pair.
When a process opens /dev/ptmx, it gets a file descriptor for a pseudo-terminal master (PTM), and a pseudo-terminal slave (PTS) device is
created in the /dev/pts directory. Each file descriptor obtained by opening /dev/ptmx is an independent PTM with its own associated PTS,
whose path can be found by passing the descriptor to ptsname(3).
Before opening the pseudo-terminal slave, you must pass the master's file descriptor to grantpt(3) and unlockpt(3).
Once both the pseudo-terminal master and slave are open, the slave provides processes with an interface that is identical to that of a real
terminal.
Data written to the slave is presented on the master descriptor as input. Data written to the master is presented to the slave as input.
In practice, pseudo-terminals are used for implementing terminal emulators such as xterm(1), in which data read from the pseudo-terminal
master is interpreted by the application in the same way a real terminal would interpret the data, and for implementing remote-login pro-
grams such as sshd(8), in which data read from the pseudo-terminal master is sent across the network to a client program that is connected
to a terminal or terminal emulator.
Pseudo-terminals can also be used to send input to programs that normally refuse to read input from pipes (such as su(1), and passwd(1)).
FILES
/dev/ptmx, /dev/pts/*
NOTES
The Linux support for the above (known as Unix98 pty naming) is done using the devpts file system, that should be mounted on /dev/pts.
Before this Unix98 scheme, master ptys were called /dev/ptyp0, ... and slave ptys /dev/ttyp0, ... and one needed lots of preallocated
device nodes.
SEE ALSO getpt(3), grantpt(3), ptsname(3), unlockpt(3), pty(7)COLOPHON
This page is part of release 3.27 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/.
Linux 2002-10-09 PTS(4)
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