1 | /* struct ipc_perm definition. |
2 | Copyright (C) 2019-2022 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 | |