ttyS0 access

[Antonio Augusto Todo Bom Neto]

On Sat, 13 Oct 2001 10:17:36 -0400 (EDT)
lawson_whitney at juno.com wrote:

> | Until last week my wine runs a Microcontroler Programmer under serial
> | port very well,
> | But in this week have problems to work wine for serial ports on my new
> | Mandrake 8.1.
> |
> | Well, in Mdk 8.1 there is no ttyS0 devices but links to /dev/tts/0 and
> | /dev/tts/1
> 
> I wondered when a distro would use devfs.  devfs is a kernel option for
> the 2.4.x kernels, you can disable it at boot time if you like, but I
> have never done so and have lost track of how.  This mail comes to you
> by Wine over /dev/tts/3, kernel 2.4.10 with devfs and devfsd, so it can
> be done.  First, make sure devfsd is running:
> 
> ps xa|grep -v grep|grep devfsd
> 
> I reckon it is:  it is what makes the symbolic links to /dev/tts/.
> 
> Now have a look at /etc/devfsd.conf ... this is what I did to the
> default devfsd.conf, probably I had a reason:
> 
> --- devfsd.conf	Mon Jul  3 16:46:32 2000
> +++ /etc/devfsd.conf	Sun Aug 12 20:55:18 2001
> @@ -27,6 +27,9 @@
> 
>  #
>  # Uncomment this if you want permissions to be saved and restored
> -#REGISTER	.*		COPY	/dev-state/$devname $devpath
> -#CHANGE		.*		COPY	$devpath /dev-state/$devname
> -#CREATE		.*		COPY	$devpath /dev-state/$devname
> +REGISTER	tts/.*		COPY	/dev-state/$devname $devpath
> +CHANGE		tts/.*		COPY	$devpath /dev-state/$devname
> +CREATE		tts/.*		COPY	$devpath /dev-state/$devname
> +REGISTER	vc/.*		COPY	/dev-state/$devname $devpath
> +CHANGE		vc/.*		COPY	$devpath /dev-state/$devname
> +CREATE		vc/.*		COPY	$devpath /dev-state/$devname
> 
> In case you are not used to reading unified diffs, this is what I end up
> with at the end of devfsd.conf:
> 
> #
> # Uncomment this if you want permissions to be saved and restored
> REGISTER	tts/.*		COPY	/dev-state/$devname $devpath
> CHANGE		tts/.*		COPY	$devpath /dev-state/$devname
> CREATE		tts/.*		COPY	$devpath /dev-state/$devname
> REGISTER	vc/.*		COPY	/dev-state/$devname $devpath
> CHANGE		vc/.*		COPY	$devpath /dev-state/$devname
> CREATE		vc/.*		COPY	$devpath /dev-state/$devname
> |
> | I realy don't remember how was until last week, but I think about users
> | and perms to devices.
> | I try to chmod a+rw for /dev/tts/0 and tts/1 but does not work.
> 
> Now give devfsd a SIGHUP and try your chmod again, or maybe one a little
> less sloppy.  Do you really want just _anybody_ to use a comm port?
> 
> killall -HUP devfsd
> |
> | In the bash where I call the wine messages apears like that:
> | fixme:comm:EnableCommNotification16 no handle for cid = ffffffff!
> | ...
> | fixme:comm:CloseComm16 no cid=-1 found!
> |
> All this just says the open failed, but the stupid app is trying to use
> it anyway.
> |
> | 	Please, if anyone can aid me about access serial ports reply
> | me, cause I need it to my job. Tanx all.
> |
> | 	Antonio Augusto Todo Bom Neto
> |
> | PS: Very thanks to Bernhard Rosenkränzer for the Daily rpm build in the
> | site www.linux-easy.com.
> |
> You can find more doco in man devfsd, maybe /usr/share/doc/devfsd*, and
> 
> http://www.atnf.csiro.au/~rgooch/linux/docs/devfs.html
> http://www.atnf.csiro.au/~rgooch/linux/
> 
> If you installed kernel source,
> <linux>/Documentation/filesystems/devfs/
> 
> Lawson
> ---oof---

Dear Mr. Lawson,

	Thank you for the information about devfs, I am studig it now. But the MPLAB cant open serial port yet. I did what you wrote me, inserting that lines at the end of devfs.conf, but nothing was change in /dev directory, there is /dev/tts/0 and /dev/tts/1 yet, and my program cant open it.

	I'll looking for problems in my application now, cause maybe exists any error and its installation or anythink about.

	The lines apears like I wrote yet, in the shell window where I open the wine.

	Thank you very much.

	Antonio