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Linux Programming - Serial Link

Posted on 2004-04-05
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Hi,

I need to use a serial link between 2 computers for a homework at school (XMODEM protocol implementation); since I'm not in the mood of buying a serial cable, I want to know if it's possible to emulate it, on the same computer (i.e. by using devices /dev/ttyS0 and /dev/ttyS1 to simulate the local and the remote port of the serial link. Anything I write in one I should be able to read from another.). Are there any drivers/programs to do this?

Thanks in advance.
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Question by:Dragon_Krome
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Alf666 earned 2000 total points
ID: 10759219
Use /dev/ttyq? and /dev/ptyq?. They are inter-connected.

For example : /dev/ttyqf and /dev/ptyqf.

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by:oumer
ID: 10759335
Everything (almost) you want to know about serial programming could be found
http://www.easysw.com/~mike/serial/serial.html
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by:Dragon_Krome
ID: 10759360
oumer, thanks for the link, but it's not a matter of programming the serial port, but emulating a virtual link.

Alf666: I'm looking at this /dev/ttyq? and /dev/ptyq? stuff, it's interesting and might be just what I need, but I'm not yet able to transfer a file via XMODEM. Seems the ptyq? must be opened first... Still looking into this.
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by:Dragon_Krome
ID: 10759435
Thanks for the answer Alf , I had no idea about this stuff, but it works! Earlier i had troubles because of a badly coded comm program. :)
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by:Alf666
ID: 10759448
Yes. The pty is the slave and must be opened first. Then the tty.
It's a bit kludgy to use, but damn useful.

I don't remember though if they can pseudo-handle hardware signaling. It's been too long since I've played with this last :-)
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