Anyone here familiar with the rules about sigaltstack and signal handers?

eg what if the signal handler does not return? (and we take another signal)

gwr: looks to me like it just pushes another frame on the alternate stack and keeps going. see how "newstack" is computed in sendsig() in uts/intel/os/sendsig.c

Thanks. Looking at some complicated code in dotnet that switches stacks, but leaves SS_ONSTACK set.

it only sets the new fp to the top of the alternate stack if SS_ONSTACK is cleared in the signal stack state.

I think maybe it should clear that if it uses setcontext to leave the alt stack?

depends if there's any live state on the alt stack that would be clobbered by a fresh signal.

Though I'm not sure we ever take more than one signal that has SA_ONSTACK in the sigaction.

There's some weird stuff going on, and I wondered if it was conforming to expectations around our signals implementation.

So, an interesting thing we've sort of run into before is that this is all a mess

a lot of the nitty gritty that turns out to matter isn't really specified

so you really do have to go through looking at what they tried to make happen, and what we're going to do (just implementation-wise)

gwr: have you looked at any nested stuff via uc_link?

is dotnet?

yes

Yes, dotnet. I have not noticed any uc_link following

Just stack switching beyond what signal handlers may do for you.

and generally non-portable context mucking abount.

yeah, stuff poking in contexts is an exciting mess :\

where is setcontext hiding? (opengroc doesn't show it?)

oh, it's a syscall

no in sigaction. huh.

Hi, I've got a question about zoned zfs datasets: If I have a zoned dataset, that is mount in zoneA, can I somehow also access the files in zoneB? E.g. via some kind of bind mounts? But not via network shares (higher latency).

Not a delegated dataset. If you want to share a dataset between multiple zones, create it in the global zone and share it as an fs resource (type=lofs) into each zone that needs it

OK. My plan was to run the SMB server in a zone with zoned datasets. But the media server in another zone should have non network access to the files.

Then I'll put the SMB server in the global zone

unixery: fwiw you can still share via SMB in a zone from a lofs mount

yeah, anything visible in the zone should be able to be shared via SMB

(yay power is back)

glad you're above water, etc, jbk

How long was it gone?

about aa day and a half

my internet is still out (using my phone).. though I think that's starting to get congested as a result

richlowe: i'm on the 4th floor, so if i'm under water, there's far more serious problems :)

the flooding though from the hurricane wasn't too bad..

not much different from a heavy downpour and had mostly drained by the afternoon.. not like Ike where I-10 still looked like a river the next day