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 __uid_t uid; /* Owner's user ID. */ 47 __gid_t gid; /* Owner's group ID. */ 48 __uid_t cuid; /* Creator's user ID. */ 49 __gid_t cgid; /* Creator's group ID. */ 50 unsigned short int mode; /* Read/write permission. */ 51 unsigned short int __pad1; 52 unsigned short int __seq; /* Sequence number. */ 53 unsigned short int __pad2; 54 unsigned long int __unused1; 55 unsigned long int __unused2; 56 }; 57
