1/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_IPC_H
19# error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
20#endif
21
22#include <bits/types.h>
23
24/* Mode bits for `msgget', `semget', and `shmget'. */
25#define IPC_CREAT 01000 /* Create key if key does not exist. */
26#define IPC_EXCL 02000 /* Fail if key exists. */
27#define IPC_NOWAIT 04000 /* Return error on wait. */
28
29/* Control commands for `msgctl', `semctl', and `shmctl'. */
30#define IPC_RMID 0 /* Remove identifier. */
31#define IPC_SET 1 /* Set `ipc_perm' options. */
32#define IPC_STAT 2 /* Get `ipc_perm' options. */
33#ifdef __USE_GNU
34# define IPC_INFO 3 /* See ipcs. */
35#endif
36
37/* Special key values. */
38#define IPC_PRIVATE ((__key_t) 0) /* Private key. */
39
40
41/* Data structure used to pass permission information to IPC operations. */
42struct ipc_perm
43 {
44 __key_t __key; /* Key. */
45 __uid_t uid; /* Owner's user ID. */
46 __gid_t gid; /* Owner's group ID. */
47 __uid_t cuid; /* Creator's user ID. */
48 __gid_t cgid; /* Creator's group ID. */
49 unsigned short int mode; /* Read/write permission. */
50 unsigned short int __pad1;
51 unsigned short int __seq; /* Sequence number. */
52 unsigned short int __pad2;
53 __syscall_ulong_t __glibc_reserved1;
54 __syscall_ulong_t __glibc_reserved2;
55 };
56