Shared Memory

[Gerry Tully]

I'm trying to run a program within a shared mem segment but I get the error 'trying to use shared file instead of shared memory' Also it says shmat: Permission denied. Everything else seems to be ok. Any ideas? Thanks.

[Steven E. Protter]

Details are needed to help you.

Waht kind of program, what is it supposed to do.

SEP

[Gerry Tully]

It is a Computron program related to a database that runs in it's own memory window.The first error that comes up is shmat failed for shared memory id 1faf, errno = 13.

[Jean-Luc Oudart]

Hi

would this thread be any help to you ?
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=98929

Rgds,
Jean-Luc

[Gerry Tully]

No, sorry that link didn't help. The funny thing is that I have development server that runs the program without a problem.

[Jeff Schussele · Accepted solution]

Hi Gerry,

shmat() is the shared memory attach function & err #13 is EACCES or permission denied.
Sounds like the user trying to attach to the segment does not have the permissions to do so.
Check the users involved and/or whether the program trying to attach is running in the same window as the program that created the segment.

Rgds,
Jeff

[Jim Butler]

Try looking at the privgroup manpage -

you may need to allow privs to the processes

files are /etc/privgrp
/sbin/init.d/prv_grp (I think)

Anyway, if the computron program needs shared memory access, you may have to add the group in via privgrp and crank it up.

Really just a thought....

good luck

[Gerry Tully]

Thanks for the replies. I'm guessing it's a permission problem somewhere. Just have to find it.

[Jeff Schussele]

Hi (again) Gerry,

ALL programs that need to attach to that segment must be running in the same memory window as the program that created it.

Are you starting that computrom program using
setmemwindow -i window_id start_command
as the startup command?

Rgds,
Jeff

[Gerry Tully]

Jeff, Yes, that's how I am starting it.