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ipc.h

/* Copyright (C) 1995, 1996, 1997, 1999 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#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.  */
00040 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 */
  };

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