ipcmk - Man Page

• Create a shared memory segment: ipcmk [-M|--shmem] segment_size_in_bytes
• Create a semaphore: ipcmk [-S|--semaphore] element_size
• Create a message queue: ipcmk [-Q|--queue]
• Create a shared memory segment with specific permissions (default is 0644): ipcmk [-M|--shmem] segment_size_in_bytes octal_permissions

tldr.sh

ipcmk [options]

ipcmk allows you to create POSIX and System V inter-process communication (IPC) objects: shared memory segments, message queues, and semaphore (arrays for System V).

Resources can be specified with these options:

-M,  --shmem size

Create a shared memory segment of size bytes. The size argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, etc. (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, etc.

-m,  --posix-shmem size

Create a POSIX shared memory segment of size bytes. The size argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, etc. (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, etc.

-Q,  --queue

Create a message queue.

-q,  --posix-mqueue

Create a POSIX message queue.

-S,  --semaphore number

Create a semaphore array with number of elements.

-s,  --posix-semaphore

Create a POSIX named semaphore.

-n,  --name name

Name of the POSIX IPC object. This option is mandatory for POSIX IPC objects.

Other options are:

-p,  --mode mode

Access permissions for the resource. Default is 0644.

-h,  --help

Display help text and exit.

-V,  --version

Display version and exit.

Hayden A. James, Prasanna Paithankar

ipcrm(1), ipcs(1), lsipc(1), sysvipc(7)

For bug reports, use the issue tracker.

The ipcmk command is part of the util-linux package which can be downloaded from Linux Kernel Archive.

ipcrm(1), ipcs(1), lsipc(1), pcp-ipcs(1), sysvipc(7).