bits/ipc.h

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_IPC_H
  21 # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
  22 #endif
  23
  24 #include <sys/types.h>
  25
  26 /* Mode bits for `msgget', `semget', and `shmget'.  */
  27 #define IPC_CREAT       01000           /* create key if key does not exist */
  28 #define IPC_EXCL        02000           /* fail if key exists */
  29 #define IPC_NOWAIT      04000           /* return error on wait */
  30
  31 /* Control commands for `msgctl', `semctl', and `shmctl'.  */
  32 #define IPC_RMID        0               /* remove identifier */
  33 #define IPC_SET         1               /* set `ipc_perm' options */
  34 #define IPC_STAT        2               /* get `ipc_perm' options */
  35
  36 /* Special key values.  */
  37 #define IPC_PRIVATE     ((key_t) 0)     /* private key */
  38
  39
  40 /* Data structure used to pass permission information to IPC operations.  */
  41 struct ipc_perm
  42   {
  43     __uid_t uid;                        /* owner's user ID */
  44     __gid_t gid;                        /* owner's group ID */
  45     __uid_t cuid;                       /* creator's user ID */
  46     __gid_t cgid;                       /* creator's group ID */
  47     __mode_t mode;                      /* read/write permission */
  48   };