Re: what different btw the owner uid and creator id of semaphore

["shark huang" <shark.hh@xxxxxxxxx>]

Hi:

On Fri, Dec 26, 2008 at 1:32 PM, ajit mote <mail2blackmen@xxxxxxxxx> wrote:

On Fri, Dec 26, 2008 at 10:34 AM, shark huang <shark.hh@xxxxxxxxx> wrote:

Hi:
Thanks.

On Fri, Dec 26, 2008 at 12:05 PM, ajit mote <mail2blackmen@xxxxxxxxx> wrote:

On Thu, Dec 25, 2008 at 7:39 AM, shark huang <shark.hh@xxxxxxxxx> wrote:

How can I know who own the semaphore at one moment?

ipcs -s

 'cat /proc/sysvipc/sem' should be same.

 

 

On Thu, Dec 25, 2008 at 12:26 AM, shark huang <shark.hh@xxxxxxxxx> wrote:

Hi:

  is the value of cuid and uid always same? Looks like they only are given a same value in function "ipc_addid", which means the value was initialized when the semaphore is created.

  When performing the first task, the process which calls semget becomes the owner/creator, and  Remember, ownership can be changed, but the creating process always remains the creator. So values of uid and cuid may not be always same.

    Several user can operate one semaphore  at the same time, so how to decide who is the owner  ? Could you show me in source code？ 

br

shark

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Thanks & Regards,
Ajit Subhash Mote

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Thanks & Regards,
Ajit Subhash Mote