The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> sys/ipc.h - XSI interprocess communication access structure

#### SYNOPSIS

> `[XSI] #include <sys/ipc.h>`

#### DESCRIPTION

> The <sys/ipc.h> header is used by three mechanisms for XSI interprocess communication (IPC): messages, semaphores, and shared memory. All use a common structure type, ipc_perm, to pass information used in determining permission to perform an IPC operation.

> The <sys/ipc.h> header shall define the ipc_perm structure, which shall include the following members:

>     uid_t    uid    Owner's user ID.
>     gid_t    gid    Owner's group ID.
>     uid_t    cuid   Creator's user ID.
>     gid_t    cgid   Creator's group ID.
>     mode_t   mode   Read/write permission.

> The <sys/ipc.h> header shall define the uid_t, gid_t, mode_t, and key_t types as described in <sys/types.h>.

> The <sys/ipc.h> header shall define the following symbolic constants.

> Mode bits:

> IPC_CREAT
>   Create entry if key does not exist.
> IPC_EXCL
>   Fail if key exists.
> IPC_NOWAIT
>   Error if request must wait.

> Keys:

> IPC_PRIVATE
>   Private key.

> Control commands:

> IPC_RMID
>   Remove identifier.
> IPC_SET
>   Set options.
> IPC_STAT
>   Get options.

> The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.

>     key_t  ftok(const char *, int);

The following sections are informative.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> <sys/types.h>

> XSH ftok

#### CHANGE HISTORY

> First released in Issue 2. Derived from System V Release 2.0.

#### Issue 7

> This reference page is clarified with respect to macros and symbolic constants.

End of informative text.

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