[PLUG] Loss of symbolic link in /dev on re-boot

[Eric Wilhelm]

# from Richard C. Steffens
# on Thursday 27 December 2007 09:28:

>It occurs to me that another possibility would be to create the
> symbolic link in the same directory as the X10 program config file
> (so I'll know where to find it). That way, if sometime down the road
> I needed to change from ttyS0 to ttyS1 (or something like that), I
> could just recreate the link. And, the link would not go away on
> re-boot.

It just clicked for me that this is not a usb serial port -- guess I 
thought the regular ones were extinct :-D

Yes, it would be simpler to do without udev, but I think you might want 
to go with a line in rc.local ('ln -s ttyS0 /dev/X10') rather than 
having a link to a device outside of /dev (where one would otherwise 
expect a directory of regular files.)

Consider:

  grep foo /dev/ttyS0

That probably hangs because it never gets EOF -- at least that's how my 
treo behaves.  Thus, you'll be setting yourself up for a future 
head-scratching if you have a link to the device laying around 
somewhere and you do a `grep -r` there.

--Eric
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