Re: [9fans] Question about o/mero -> o/live event notification mechanism

[Nemo <nemo@lsub.org>]

On Apr 30, 2012, at 11:54 PM, aram wrote:

> Hi,
> 
> i explore the UI of octopus and i try to understand how omero notifies the viewers for events.
> It is apparent from the documentation that the viewers "read" events from the ui/olive file.
> However, when i cat that file from the shell and "play" with a terminal a bit, i get no data.
> The terminals are updated correctly which indicates that the events are delivered.
> I checked the source of olive (port/live/live.b) and it simply reads (by calling updateproc(fd)) the file as expected.
> 
> Obviously i am missing something important that the documentation does not cover.
> How can i read events posted by omero?
> 
> Thanks

There are two type of events. IIRC.
User events like open, exec, ... are posted via o/ports, and you can
read them from there.

UI events are sent through a file with a protocol for o/live.
(Time ago they were sent also through ports, but I think I changed that).
The viewer reads a tree and then gets updates from that file.
That's internal and I don't think the man page describes that.

I can take a look to the source so I remember if you don't have luck
with these hints.

hth