sysdeps/gnu/bits/ipc.h

   1 /* Copyright (C) 1995-1999, 2000 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_IPC_H
  20 # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
  21 #endif
  22
  23 #include <bits/types.h>
  24
  25 /* Mode bits for `msgget', `semget', and `shmget'.  */
  26 #define IPC_CREAT       01000           /* Create key if key does not exist. */
  27 #define IPC_EXCL        02000           /* Fail if key exists.  */
  28 #define IPC_NOWAIT      04000           /* Return error on wait.  */
  29
  30 /* Control commands for `msgctl', `semctl', and `shmctl'.  */
  31 #define IPC_RMID        0               /* Remove identifier.  */
  32 #define IPC_SET         1               /* Set `ipc_perm' options.  */
  33 #define IPC_STAT        2               /* Get `ipc_perm' options.  */
  34 #ifdef __USE_GNU
  35 # define IPC_INFO       3               /* See ipcs.  */
  36 #endif
  37
  38 /* Special key values.  */
  39 #define IPC_PRIVATE     ((__key_t) 0)   /* Private key.  */
  40
  41
  42 /* Data structure used to pass permission information to IPC operations.  */
  43 struct ipc_perm
  44   {
  45     __key_t __key;                      /* Key.  */
  46     unsigned short int uid;             /* Owner's user ID.  */
  47     unsigned short int gid;             /* Owner's group ID.  */
  48     unsigned short int cuid;            /* Creator's user ID.  */
  49     unsigned short int cgid;            /* Creator's group ID.  */
  50     unsigned short int mode;            /* Read/write permission.  */
  51     unsigned short int __seq;           /* Sequence number.  */
  52   };