Re: [lcd4linux] Segmentation fault(due to config file?)

[tasos <ta...@ya...>]

Thanks for the reply.Actually i don't know if this
solution is what i really need.I will see what i can
do,although.
Waiting some news for the segmentation fault error
from michael.

--- Ernst Bachmann <e.b...@xe...> wrote:

> On Tuesday 12 September 2006 13:43, tasos wrote:
> > Hello ernst.
> > Until now i'm using this rule in udev in order to
> > recognise my devices.
> > BUS=="usb",SYSFS{interface}=="Crystalfontz CFA-635
> USB
> > LCD", KERNEL=="ttyUSB*",
> > SYMLINK+="lcd1/%k",MODE="0666"
> >
> > I will use more than one devices.So my question
> is.
> > I will launch lcd4linux -f foo,lcd4linux -f bar
> etc.
> > Will those processes killed automatically if i use
> > udev.i mean when foo which uses ttyUSB6,is
> > disconnected will udev recognise the correct
> lcd4linux
> > process?
> > If so can you help me a little bit.
> 
> Well, unfortunatly the name and location of the
> PIDFILE written by lcd4linux 
> is hardcoded, to run multiple instances this needs
> to be fixed first (e.g. 
> make lcd4linux accept a command-line parameter
> specifing the pidfile 
> location)
> 
> Then, for each device in question, write a little
> shellscript (forking 
> lcd4linux, and killing it), add it to your udev
> rule:
> ...MODE="0666",RUN+="/path/my_lcd_1_script"
> ...MODE="0666",RUN+="/path/my_lcd_2_script" for the
> second lcd and so on.
> 
> the script would be something like:
> --- /path/my_lcd_1_script ---
> #!/bin/sh
> if [ "$ACTION" = remove ]; then
>    # Kill running lcd4linux
>    kill `cat /var/run/lcd4linux_1.pid`
> else
>    # start new lcd4linux process, assert
> $ACTION==add
>    lcd4linux -f /etc/my_lcd_1_config.cfg
> --pidfile=/var/run/lcd4linux_1.pid
> fi
> -----------------------------
> (With more sanity checks added, like checking for
> the pidfile, check if the 
> pid belongs to lcd4linux, etc. maybe use a distro
> tool 
> like "start-stop-deamon" for this, they usually
> contain most of those checks 
> already...)
> 
> have a look at the udev manpage for more info, esp.
> how to pass the location 
> of the devicenode to your script etc.
> 
> 
> 
> > BTW is it so difficult to add some code which will
> > disconnect it automatically?
> > Thank you in advance!
> 
> Well, in that case, it is. The kernel only presents
> a virtual comport to 
> lcd4linux, and lcd4linux only notices its gone when
> it tries to use it.
> 
> Devices/Drivers that work directly with usb (libusb)
> have it easier here, they 
> can notice the disconnect, but AFAIK don't shutdown
> then.
> Some drivers (lcd2usb for example) even try to wait
> for an eventual reconnect 
> of the device, they keep running on purpose.
> 
> 
> /Ernst
> 
>
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