Interprocess Communication Debugging Support (ipc)

The ipc module provides debugging support for the implementation of the message queue, semaphore, and shared memory interprocess communication primitives.

dcmds

::ipcs [-l]

Display a listing of system-wide IPC identifiers, corresponding to known message queues, semaphores, and shared memory segments. If the -l option is specified, a longer listing of information is shown.

[ address ] ::msqid_ds [-l]

Print the specified msqid_ds structure or a table of the active msqid_ds structures (message queue identifiers). If the -l option is specified, a longer listing of information is displayed.

[ address ] ::semid_ds [-l]

Print the specified semid_ds structure or a table of the active semid_ds structures (semaphore identifiers). If the -l option is specified, a longer listing of information is displayed.

[ address ] ::shmid_ds [-l]

Print the specified shmid_ds structure or a table of the active shmid_ds structures (shared memory segment identifiers). If the -l option is specified, a longer listing of information is displayed.

Walkers

msg

Walk the active msqid_ds structures corresponding to message queue identifiers. This structure is defined in <sys/msg.h>.

sem

Walk the active semid_ds structures corresponding to semaphore identifiers. This structure is defined in <sys/sem.h>.

shm

Walk the active shmid_ds structures corresponding to shared memory segment identifiers. This structure is defined in <sys/shm.h>.