/proc/sysvipc/ - System V IPC
/proc/sysvipc/Subdirectory containing the pseudo-files msg, sem
and shm. These files list the System V Interprocess
Communication (IPC) objects (respectively: message queues, semaphores,
and shared memory) that currently exist on the system, providing similar
information to that available via ipcs(1). These files
have headers and are formatted (one IPC object per line) for easy
understanding. sysvipc(7) provides further background
on the information shown by these files.
proc(5)