1 /* struct ipc_perm definition.
2    Copyright (C) 2019-2021 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <http://www.gnu.org/licenses/>.  */
18 
19 #ifndef _SYS_IPC_H
20 # error "Never use <bits/ipc-perm.h> directly; include <sys/ipc.h> instead."
21 #endif
22 
23 /* Data structure used to pass permission information to IPC operations.
24    It follows the kernel ipc64_perm size so the syscall can be made directly
25    without temporary buffer copy.  However, since glibc defines the MODE
26    field as mode_t per POSIX definition (BZ#18231), it omits the __PAD1 field
27    (since glibc does not export mode_t as 16-bit for any architecture).  */
28 struct ipc_perm
29 {
30   __key_t __key;				/* Key.  */
31   __uid_t uid;					/* Owner's user ID.  */
32   __gid_t gid;					/* Owner's group ID.  */
33   __uid_t cuid;					/* Creator's user ID.  */
34   __gid_t cgid;					/* Creator's group ID.  */
35   __mode_t mode;				/* Read/write permission.  */
36   unsigned short int __seq;			/* Sequence number.  */
37   unsigned short int __pad2;
38   __syscall_ulong_t __glibc_reserved1;
39   __syscall_ulong_t __glibc_reserved2;
40 };
41