socat - define device

[eslavko]

Hello...
I need serial loopback device and I use socat to create it.

socat -d -d pty,raw,echo=0 pty,raw,echo=0

It works but I wish to be able to set device name.
Ie when I start I usaly got /dev/pts/23 and /dev/pts/24 but sometime I got /dev/pts/11 and /dev/pts/24.
Is there a way to set permanent pts ports (/dev/pts/98 and /dev/pts/99 for example?)

Thanks

[schragge]

From the socat(1) manpage:

link=<filename>
Generates a symbolic link that points to the actual pseudo terminal (pty). This might help to solve the problem that ptys are generated with more or less unpredictable names, making it difficult to directly access the socat generated pty automatically. With this option, the user can specify a "fix" point in the file hierarchy that helps him to access the actual pty (example). Beginning with socat version 1.4.3, the symbolic link is removed when the address is closed (but see option unlink-close).

[eslavko]

Hello...
I can't figure out how to create two pts's and linked with link...
Can someone provide commandline?

Thanks

[schragge]

Does this work for you?

socat -d -d pty,raw,echo=0,link=/tmp/ttyV0 pty,raw,echo=0,link=/tmp/ttyV1

[eslavko]

Does this work for you?

socat -d -d pty,raw,echo=0,link=/tmp/ttyV0 pty,raw,echo=0,link=/tmp/ttyV1

Yes...
That's work. Now if I understand correctly socat opens two /dev/pts/ (with number not constant) but linked to constant /tmp/ttyVx...

Thanks.