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| 1 | /* Copyright (C) 1995-2022 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, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _SYS_IPC_H |
| 19 | # error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead." |
| 20 | #endif |
| 21 | |
| 22 | #include <bits/types.h> |
| 23 | |
| 24 | /* Mode bits for `msgget', `semget', and `shmget'. */ |
| 25 | #define IPC_CREAT 01000 /* create key if key does not exist */ |
| 26 | #define IPC_EXCL 02000 /* fail if key exists */ |
| 27 | #define IPC_NOWAIT 04000 /* return error on wait */ |
| 28 | |
| 29 | /* Control commands for `msgctl', `semctl', and `shmctl'. */ |
| 30 | #define IPC_RMID 0 /* remove identifier */ |
| 31 | #define IPC_SET 1 /* set `ipc_perm' options */ |
| 32 | #define IPC_STAT 2 /* get `ipc_perm' options */ |
| 33 | |
| 34 | /* Special key values. */ |
| 35 | #define IPC_PRIVATE ((key_t) 0) /* private key */ |
| 36 | |
| 37 | |
| 38 | /* Data structure used to pass permission information to IPC operations. */ |
| 39 | struct ipc_perm |
| 40 | { |
| 41 | __uid_t uid; /* owner's user ID */ |
| 42 | __gid_t gid; /* owner's group ID */ |
| 43 | __uid_t cuid; /* creator's user ID */ |
| 44 | __gid_t cgid; /* creator's group ID */ |
| 45 | __mode_t mode; /* read/write permission */ |
| 46 | }; |
| 47 |
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