Re: ugen(4) and poll(2)

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Hasso Tepper wrote:
> As far as I can see what happens is that daemon opens ugen(4) device 
> correctly and starts to poll(2) interrupt endpoint of the device (devices 
> have single interface). The trouble is that poll(2) seems to ignore 
> timeout. It doesn't return until there is data available in the 
> descriptor. Ie I can make poll(2) to return with poking device, but till 
> then it blocks.
>
> Before I dig deep into areas I'm not familiar with ... Any ideas why and 
> where it might happen? Anyone seen something like this?

In which waitchan is the process?  If it is in "poll" and you're really 
passing a proper timeout value, then everything should work as advertised. 
 Does a ktrace show only the poll and no return?  Sometimes processes 
tend to re-call poll over and over again (maybe due to an interrupting 
signal).

cheers
  simon

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