Re: /dev/cu.* vs /dev/tty.* ?
Re: /dev/cu.* vs /dev/tty.* ?
- Subject: Re: /dev/cu.* vs /dev/tty.* ?
- From: "Justin C. Walker" <email@hidden>
- Date: Thu, 15 Jun 2006 12:36:05 -0700
On Jun 15, 2006, at 12:26 , Andre-John Mas wrote:
Hi,
I am using the Java Communications API, implemented at rxtx.org and
whe I call the API it lists both the /dev/cu and /dev/tty devices.
I am not sure that both need to be listed, especially if this is
presented to the user. Some people feel both should be listed,
others like myself don't think so.
I hoping someone who is more familiar with the inner workings can
tell me what the difference is between the two, and more
specifically which one a serial communication tool should use.
Typically, the tty* and cu* are different versions of the same
"physical" thing: the tty's are for incoming (to the system) calls;
the cu's are for outgoing (from the system) calls ("cu" == "call
unix"; don't ask :-}). You can match them with their major/minor
pairs, noting that the cu devices have odd minors, while the tty
devices have even minors ('OR'ing a low-order bits gets you the "cu"
for a corresponding "tty").
I don't know that this helps you much :-}
Cheers,
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for the Absorption of Federal Funds
--------
Some people have a mental horizon of radius zero, and
call it their point of view.
-- David Hilbert
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