Back to index

glibc  2.9
ipc.h
Go to the documentation of this file.
00001 /* Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef _SYS_IPC_H
00020 # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."
00021 #endif
00022 
00023 #include <bits/types.h>
00024 
00025 /* Mode bits for `msgget', `semget', and `shmget'.  */
00026 #define IPC_CREAT    01000         /* create key if key does not exist */
00027 #define IPC_EXCL     02000         /* fail if key exists */
00028 #define IPC_NOWAIT   04000         /* return error on wait */
00029 
00030 /* Control commands for `msgctl', `semctl', and `shmctl'.  */
00031 #define IPC_RMID     0             /* remove identifier */
00032 #define IPC_SET             1             /* set `ipc_perm' options */
00033 #define IPC_STAT     2             /* get `ipc_perm' options */
00034 
00035 /* Special key values.  */
00036 #define IPC_PRIVATE  ((key_t) 0)   /* private key */
00037 
00038 
00039 /* Data structure used to pass permission information to IPC operations.  */
00040 struct ipc_perm
00041   {
00042     __uid_t uid;                   /* owner's user ID */
00043     __gid_t gid;                   /* owner's group ID */
00044     __uid_t cuid;                  /* creator's user ID */
00045     __gid_t cgid;                  /* creator's group ID */
00046     __mode_t mode;                 /* read/write permission */
00047   };