chown shared memory?

[Andy McDade]

Is there any way of changing the ownership of a shared memory segment? At the moment we have an application which uses a fairly large chunk of shared memory, and doesn't always get created by the right user. We have to remove the segment and reinitialise it using the correct user - if there was a utility to change the ownership that would be great.

[Paula J Frazer-Campbell]

Andy

Instead of fixing the end result why not fix it at source.

Get the software guys to do the job correctly.

Paula

[Clemens van Everdingen]

Hi,

I don't believe we can chown shared memory, but why doing this ?
Solve the problem why it gets the wrong owner !
Ask the programmers to do their job. This instead of you fixing their problems.

C.

[Andy McDade]

If only I could. The developers have "many more important" things to do before getting around to this. I want to make my life easier in the (posisbly very long) meantime.

[Clemens van Everdingen]

Hi,

As I already said, I don't think it can be done on OS level. It has to be done on program level.

C.

[Paula J Frazer-Campbell]

Andy

If the ownership of this shared memory causes a problem then options:-

1. Get Dev to fix it.
2. Fix as you are doing.
3. Change user profiles/groups so that there is no ownership problem.
4. Put script in place to pick up the wrong ownership and either fix it / zap the user or send out warning.

5. Option the last - forget about it - Its Friday the sun is shining and the Pubs are open.

;^)

Paula

[Clemens van Everdingen]

Paula,

The last option is the best :-)

Clemens

[Paula J Frazer-Campbell]

Hi

As Andy is from the UK I thought he would appreciate that.


;^)

Paula

[Roger Baptiste]

hi,

I don't think it is possible on an existing shared memory being used. You have to do it at the source level.

HTH
raj

[Deepak Extross]

Andy,
Not sure if there's a tool out there yet, but you can roll-your-own utility to do this using shmctl().
man shmctl for details.
But as others have pointed out, this is best addressed by the developers.

[Steve Lewis]

Why not create a new group, which the owner process/user and all attachers to the segment are a member of?

If you do ipcs -ma you see owner and group permissions listed. Surely grouping them all together will fix it.