freebsd man page for ipc

ipc.h(3HEAD)                                                          Headers                                                         ipc.h(3HEAD)

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)

SunOS 5.10                                                          10 Sep 2004                                                       ipc.h(3HEAD)