how to determine which process is using a queue?

Question

I have a message queue id, i need to determine which processes are reading from and writing to that queue. Is there a possible option that can be used with 'ipcs'?

ipcs -q|grep qid 

this doesn't provide those details. Thanks

Answer 1

You can only retrieve the last PID that called msgsnd() and the last PID that called msgrcv() for the specified System V message queue.

You can use:

ipcs -q -p

It will output:

------ Message Queues PIDs --------
msqid      owner      lspid      lrpid     

Where:

• lspid - PID of last msgsnd()
• lrpid - PID of last msgrcv()