glibc (2.38)
1 /* struct ipc_perm definition.
2 Copyright (C) 2019-2023 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 };
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