 <p>So for now solution seems to be to list <code>/dev/shm</code> e.g.</p> <pre><code>$ ls -al /dev/shm/sem.*|more -rw------- 1 auniyal auniyal 16 2011-08-09 15:59 /dev/shm/sem.mysem -rw------- 1 auniyal auniyal 16 2011-08-09 16:29 /dev/shm/sem.mysem1 -rw------- 1 auniyal auniyal 16 2011-08-09 16:37 /dev/shm/sem.mysem2 -rw------- 1 auniyal auniyal 16 2011-08-09 16:37 /dev/shm/sem.mysem3 -rw------- 1 auniyal auniyal 16 2011-08-09 16:39 /dev/shm/sem.mysem4 ... </code></pre>