proc_sysvipc - Man Page

/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)