1/* Generic implementation of the SysV message struct msqid_ds.
2 Copyright (C) 2020-2022 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 <https://www.gnu.org/licenses/>. */
18
19#ifndef _SYS_MSG_H
20# error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
21#endif
22
23#include <bits/types/time_t.h>
24
25/* Structure of record for one message inside the kernel.
26 The type `struct msg' is opaque. */
27struct msqid_ds
28{
29#ifdef __USE_TIME_BITS64
30# include <bits/types/struct_msqid64_ds_helper.h>
31#else
32 struct ipc_perm msg_perm; /* structure describing operation permission */
33# if __TIMESIZE == 32
34 __time_t msg_stime; /* time of last msgsnd command */
35 unsigned long int __msg_stime_high;
36 __time_t msg_rtime; /* time of last msgsnd command */
37 unsigned long int __msg_rtime_high;
38 __time_t msg_ctime; /* time of last change */
39 unsigned long int __msg_ctime_high;
40# else
41 __time_t msg_stime; /* time of last msgsnd command */
42 __time_t msg_rtime; /* time of last msgsnd command */
43 __time_t msg_ctime; /* time of last change */
44# endif
45 __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
46 msgqnum_t msg_qnum; /* number of messages currently on queue */
47 msglen_t msg_qbytes; /* max number of bytes allowed on queue */
48 __pid_t msg_lspid; /* pid of last msgsnd() */
49 __pid_t msg_lrpid; /* pid of last msgrcv() */
50 __syscall_ulong_t __glibc_reserved4;
51 __syscall_ulong_t __glibc_reserved5;
52#endif
53};
54

source code of include/x86_64-linux-gnu/bits/types/struct_msqid_ds.h