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Shell Programming and Scripting
Read input from another tty
Post 302686463 by colinireland on Tuesday 14th of August 2012 03:34:13 PM
08-14-2012
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LEARN ABOUT LINUX
ptmx
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)