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  From: Alan Kennington <akenning@topology.org>
  To  : Alan Kennington <akenning@dog.topology.org>
  Date: Thu, 26 Apr 2001 19:03:19 +0930

Re: how to diagnose a /dev/ttyS1 permission denied problem [fixed]

On Thu, Apr 26, 2001 at 06:37:54PM +0930, Alan Kennington wrote:
> Sorry to ask about something as uncool as a serial port, but
> I've just bought an el whizzo UPS, which has a serial interface,
> and I've got the right cable etc.
> 
> However, I get this:
> 
> ========================================================
> [root@fox nut]# apcsmart /dev/ttyS1
> Network UPS Tools - APC Smart protocol driver 0.54 (0.44.3)
> apcsmart: Unable to open (1) /dev/ttyS1: Permission denied  
> ========================================================


My very sincere apologies for that.
After exhausting all tricks I knew [not very many for serial ports]
I thought it must be a difficult problem.

Little did I know that the linux UPS software `NUT' has an FAQ,
and this problem was item number one on the list.

The stupid program changes uid to "nobody" or something and then
tries to open the serial port.
And then it gives un uninformative error message!!!
Grrrrrr.....
Another wasted 2-3 hours in my life!
[The author will hear about this.]

So please ignore my last question.

I'll stand in the corner for a few hours now as penance.

Cheers,
Alan Kennington. 

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