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ipc.h
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/* Copyright (C) 1995-2018 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. */ #ifdef __USE_GNU # define IPC_INFO 3 /* See ipcs. */ #endif /* Special key values. */ #define IPC_PRIVATE ((__key_t) 0) /* Private key. */ /* Data structure used to pass permission information to IPC operations. */ struct ipc_perm { __key_t __key; /* Key. */ __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. */ unsigned short int mode; /* Read/write permission. */ unsigned short int __pad1; unsigned short int __seq; /* Sequence number. */ unsigned short int __pad2; __syscall_ulong_t __glibc_reserved1; __syscall_ulong_t __glibc_reserved2; };