Interprocess Communication 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
::msg
[-l
] [-t
type] -
Display the properties of the specified message queue element (struct
msg
). If the-l
option is present, the raw contents of the message are displayed in hexadecimal and ASCII. If the-t
option is present, it can be used to filter the output and only display messages of the specified type. This can be useful when piping the output of themsgqueue
walker to::msg
. -
id
::msqid
[-k
] -
Convert the specified message queue IPC identifier to a pointer to the corresponding kernel implementation structure and print the address of this kernel structure. If the
-k
option is present, the id is instead interpreted as a message queue key to match (seemsgget
(2)). -
[ address ]
::msqid_ds
[-l
] -
Print the specified
msqid_ds
structure or a table of the activemsqid_ds
structures (message queue identifiers). If the-l
option is specified, a longer listing of information is displayed. -
id
::semid
[-k
] -
Convert the specified semaphore IPC identifier to a pointer to the corresponding kernel implementation structure and print the address of this kernel structure. If the
-k
option is present, the id is instead interpreted as a semaphore key to match (seesemget
(2)). -
[ address ]
::semid_ds
[-l
] -
Print the specified
semid_ds
structure or a table of the activesemid_ds
structures (semaphore identifiers). If the-l
option is specified, a longer listing of information is displayed. -
id
::shmid
[-k
] -
Convert the specified shared memory IPC identifier to a pointer to the corresponding kernel implementation structure and print the address of this kernel structure. If the
-k
option is present, the id is instead interpreted as a shared memory key to match (seeshmget
(2)). -
[ address ]
::shmid_ds
[-l
] -
Print the specified
shmid_ds
structure or a table of the activeshmid_ds
structures (shared memory segment identifiers). If the-l
option is specified, a longer listing of information is displayed.