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IPC.H 3HEAD "Sep 10, 2004"
NAME
ipc.h, ipc - XSI interprocess communication access structure
SYNOPSIS

#include <sys/ipc.h>
DESCRIPTION

The <sys/ipc.h> header is used by three mechanisms for 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 ipc_perm structure contains 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 uid_t, gid_t, mode_t, and key_t types are defined as described in <sys/types.h>. See types.h(3HEAD).

Definitions are provided for the constants listed below.

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.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Standard
SEE ALSO

ftok(3C), types.h(3HEAD), attributes(5), standards(5)