sysdeps/unix/sysv/linux/sys/ipc_buf.h

   1 /* Copyright (C) 1995 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
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_IPC_BUF_H
  21 #define _SYS_IPC_BUF_H
  22
  23 #include <features.h>
  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 #define IPC_INFO        3               /* see ipcs */
  36
  37
  38 __BEGIN_DECLS
  39
  40 /* Special key values.  */
  41 #define IPC_PRIVATE     ((key_t) 0)     /* private key */
  42
  43
  44 /* Data structure used to pass permission information to IPC operations.  */
  45 struct ipc_perm
  46 {
  47   key_t __key;                          /* key */
  48   __uid_t uid;                          /* owner's user ID */
  49   __gid_t gid;                          /* owner's group ID */
  50   __uid_t cuid;                         /* creator's user ID */
  51   __gid_t cgid;                         /* creator's group ID */
  52   __mode_t mode;                        /* read/write permission */
  53   unsigned short int __seq;             /* sequence number */
  54 };
  55
  56
  57 /* Kludge to work around Linux' restriction of only up to five
  58    arguments to a system call.  */
  59 struct ipc_kludge
  60 {
  61   void *msgp;
  62   long msgtyp;
  63 };
  64
  65 /* The actual system call: all functions are multiplexed by this.  */
  66 extern int __ipc __P ((int __call, int __first, int __second, int __third,
  67                        void *__ptr));
  68
  69 /* The codes for the functions to use the multiplexer `__ipc'.  */
  70 #define IPCOP_semop      1
  71 #define IPCOP_semget     2
  72 #define IPCOP_semctl     3
  73 #define IPCOP_msgsnd    11
  74 #define IPCOP_msgrcv    12
  75 #define IPCOP_msgget    13
  76 #define IPCOP_msgctl    14
  77 #define IPCOP_shmat     21
  78 #define IPCOP_shmdt     22
  79 #define IPCOP_shmget    23
  80 #define IPCOP_shmctl    24
  81
  82 __END_DECLS
  83
  84 #endif /* sys/ipc_buf.h */