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+/* Copyright (C) 1995-2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_IPC_H
+# error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
+#endif
+
+#include <bits/types.h>
+
+/* Mode bits for `msgget', `semget', and `shmget'. */
+#define IPC_CREAT 01000 /* create key if key does not exist */
+#define IPC_EXCL 02000 /* fail if key exists */
+#define IPC_NOWAIT 04000 /* return error on wait */
+
+/* Control commands for `msgctl', `semctl', and `shmctl'. */
+#define IPC_RMID 0 /* remove identifier */
+#define IPC_SET 1 /* set `ipc_perm' options */
+#define IPC_STAT 2 /* get `ipc_perm' options */
+
+/* Special key values. */
+#define IPC_PRIVATE ((key_t) 0) /* private key */
+
+
+/* Data structure used to pass permission information to IPC operations. */
+struct ipc_perm
+ {
+ __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 */
+ };