Why are some posix shared memory segments and posix semaphores not visible to ipcs?

(Are you sure it's not removing them when it exits?) Update: Actually, after reading this thread I'm not sure ipcs is supposed to be able to show the POSIX semaphores. I tried your sample code (with some edits to fix compile errors) and you can see the shared memory segment in the /dev/shm directory.

I'm using ipcs as the same user that created the shared-memory/semaphores. The server creates the shared memory and initializes the semaphores in the shared memory. I run the server in the back-ground and then type ipcs before running the client.

– Anonymous May 18 '09 at 22:51 The client alone removes the shared-memory and semaphores when it is done. – Anonymous May 18 '09 at 22:54 Well, I tried your code sample and have a minor update; not sure how much it helps but YMMV. – Jacob Gabrielson May 18 '09 at 23:43.

Ipcs displays information on the System V IPC system. POSIX semaphores and shared memory are an independent (and better) system which is not monitored by 'ipcs'.

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