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glibc/bits/ipc.h
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/* Copyright (C) 1995-2013 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _SYS_IPC_H | |
# error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead." | |
#endif | |
#include <bits/types.h> | |
/* Mode bits for `msgget', `semget', and `shmget'. */ | |
#define IPC_CREAT 01000 /* create key if key does not exist */ | |
#define IPC_EXCL 02000 /* fail if key exists */ | |
#define IPC_NOWAIT 04000 /* return error on wait */ | |
/* Control commands for `msgctl', `semctl', and `shmctl'. */ | |
#define IPC_RMID 0 /* remove identifier */ | |
#define IPC_SET 1 /* set `ipc_perm' options */ | |
#define IPC_STAT 2 /* get `ipc_perm' options */ | |
/* Special key values. */ | |
#define IPC_PRIVATE ((key_t) 0) /* private key */ | |
/* Data structure used to pass permission information to IPC operations. */ | |
struct ipc_perm | |
{ | |
__uid_t uid; /* owner's user ID */ | |
__gid_t gid; /* owner's group ID */ | |
__uid_t cuid; /* creator's user ID */ | |
__gid_t cgid; /* creator's group ID */ | |
__mode_t mode; /* read/write permission */ | |
}; |