1/* struct ipc_perm definition.
 2   Copyright (C) 2019-2025 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).  */
28struct 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};