On Tuesday 16 March 2010 14:55:43 Milan Obuch wrote:
> Hi,
> some time ago I built a multi network monitor using older version with
> Marko Zec's vimage patch. I am trying to port it to 8-STABLE (newer
> features, easier maintenance...) with partial success.
> Basically, I use shared memory as common data area across more vimages in
> order to be able to generate quick summaries from in-memory data. I was not
> able to get it running under freshly compiler 8-STABLE, error message is
> shmget: Function not implemented
> Has anybody any idea? Patch to test to enable use of shared memory in vnet
> jails?
> Regards,
> Milan

Forget to add...

In my code, I use

 if ((shmid = shmget(shmkey,sizeof(mdc),IPC_CREAT | 0640)) == -1)

to create a shared segment and

 if ((shmid = shmget(shmkey,sizeof(mdc),0)) == -1)

to get an id for already created segment.

Both are failing under non-root vimage jail, but it works under main host. At 
first I thought shared memory is not yet virtualized, but ipcs display 
existing segments in both root/main host and vnet jail.ipcrm, however, works 
only in non-jailed host...

ipcrm: shmid(131072): : Function not implemented

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