PTY(4) BSD Kernel Interfaces Manual PTY(4)NAME
pty -- BSD-style compatibility pseudo-terminal driver
SYNOPSIS
device pty
DESCRIPTION
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device
/dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which
has the name /dev/ttyXX.
New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that
tried to open such devices when posix_openpt(2) was being called.
FILES
The BSD-style compatibility pseudo-terminal driver uses the following device names:
/dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices.
/dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices.
DIAGNOSTICS
None.
SEE ALSO posix_openpt(2), pts(4), tty(4)HISTORY
A pseudo-terminal driver appeared in 4.2BSD.
BUGS
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent
master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it.
The pty driver cannot be unloaded, because it cannot determine if it is being used.
BSD August 20, 2008 BSD
Check Out this Related Man Page
PTY(4) BSD Kernel Interfaces Manual PTY(4)NAME
pty -- BSD-style compatibility pseudo-terminal driver
SYNOPSIS
device pty
DESCRIPTION
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device
/dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which
has the name /dev/ttyXX.
New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that
tried to open such devices when posix_openpt(2) was being called.
FILES
The BSD-style compatibility pseudo-terminal driver uses the following device names:
/dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices.
/dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices.
DIAGNOSTICS
None.
SEE ALSO posix_openpt(2), pts(4), tty(4)HISTORY
A pseudo-terminal driver appeared in 4.2BSD.
BUGS
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent
master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it.
The pty driver cannot be unloaded, because it cannot determine if it is being used.
BSD August 20, 2008 BSD
Hi guys;
I want to show what am I doing on a terminal into another. I did something close but its not working really good.
Example: cat /dev/pts/12 >/dev/pts/13
where 12 is my terminal and 13 its the other terminal.
This is usefull for me to share my small unix knowledge to other people... (4 Replies)
How can I write to another user's pseudo tty, but not to its current prompt position (as in open("/dev/pts007", ...) followed by write() ). Instead I would like to write to the top center of the screen using color red, for example. Like curses, but from another console. (6 Replies)
Hi,
I want to fork a new process from a daemon that needs terminal attachment to some ttyN or pts/N device. Here is the code
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>
int main(int... (5 Replies)
hi I need a Pseudo code or a description of what a program is saying from this spec and code:
Just so i can understand how this solution was achieved, thanks
here is the spec:
Specifications are as follows:-
The books records are stored in one csv file and the layout and the contents... (7 Replies)
How can i view what my colleague is doing in the terminal pts/1 while i have logged into terminal pts/2 ?? Both have remotely logged in via ssh. (4 Replies)
Hi,
I need to provide more than one character to "> /dev/tty" through terminal/keyboard input, I have this:
ok=false
while
do
echo " Enter r1 to reformat "
> /dev/tty
read choice
case $choice in
)
echo " bla bla bla "
;;
done
However, in this way,... (3 Replies)
Hi! I want to display a message when I leave a pseudo-console (/dev/ptsX: konsole, xterm) e.g "Bye! There's still 3 pts open and 3 background processes"
I can do it in login-terminals (via .bash_logout) but not in a non-login...
Any ideas? (5 Replies)
Hi ,
I have searched wiki for pseudo tty devices but it was very complex for me to understand.
Can any one help me understanding concept behind pseudo-tty in layman language?
According to security manual of our org /etc/securetty files shouldn't have any pseudo tty devices.
i understand
ttyX... (5 Replies)
I am studying APUE(advanced programming in the unix environment). I have read up to chapter19 pseudo terminal. I know that the pty is like a fake device for programs to direct STDIN and STDOUT to. But I don't know why we need it. Can someone tell me what is the use of pseudo terminal. Thanks. (4 Replies)
Want few input related to unix environment and terminal settings:
1. Am trying to find a way to keep the unix terminal display intact even after opening and closing a vi/less file. Currently if I open a vim file in the unix terminal and then close the file,it displays the contents of vim file on... (4 Replies)
Hii friends,
Actually, I am a beginner in shell scripting. I am trying to run a master .sh file. The master .sh file will open 2 different terminals and then run .sh file on first terminal, an executable file in second terminal.
We, the beginners, can learn a lot if the "gurus" like you will... (6 Replies)
when i do something like this:
bona=$(echo hi2 > /dev/pts/1 ; printf '%s\n' "" | sed '/^$/d')
i get:
hi2
and the $bona variable is empty, when I run:
echo ${bona}
i get the result "hi2" outside of the variable. I want it stored in the bona variable with nothing outputted to the... (6 Replies)