1/* Copyright (C) 1995-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_MSG_H
19# error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
20#endif
21
22#include <bits/types.h>
23#include <bits/msq-pad.h>
24
25/* Define options for message queue functions. */
26#define MSG_NOERROR 010000 /* no error if message is too big */
27#ifdef __USE_GNU
28# define MSG_EXCEPT 020000 /* recv any msg except of specified type */
29# define MSG_COPY 040000 /* copy (not remove) all queue messages */
30#endif
31
32/* Types used in the structure definition. */
33typedef __syscall_ulong_t msgqnum_t;
34typedef __syscall_ulong_t msglen_t;
35
36#if __MSQ_PAD_BEFORE_TIME
37# define __MSQ_PAD_TIME(NAME, RES) \
38 unsigned long int __glibc_reserved ## RES; __time_t NAME
39#elif __MSQ_PAD_AFTER_TIME
40# define __MSQ_PAD_TIME(NAME, RES) \
41 __time_t NAME; unsigned long int __glibc_reserved ## RES
42#else
43# define __MSQ_PAD_TIME(NAME, RES) \
44 __time_t NAME
45#endif
46
47/* Structure of record for one message inside the kernel.
48 The type `struct msg' is opaque. */
49struct msqid_ds
50{
51 struct ipc_perm msg_perm; /* structure describing operation permission */
52 __MSQ_PAD_TIME (msg_stime, 1); /* time of last msgsnd command */
53 __MSQ_PAD_TIME (msg_rtime, 2); /* time of last msgrcv command */
54 __MSQ_PAD_TIME (msg_ctime, 3); /* time of last change */
55 __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
56 msgqnum_t msg_qnum; /* number of messages currently on queue */
57 msglen_t msg_qbytes; /* max number of bytes allowed on queue */
58 __pid_t msg_lspid; /* pid of last msgsnd() */
59 __pid_t msg_lrpid; /* pid of last msgrcv() */
60 __syscall_ulong_t __glibc_reserved4;
61 __syscall_ulong_t __glibc_reserved5;
62};
63
64#ifdef __USE_MISC
65
66# define msg_cbytes __msg_cbytes
67
68/* ipcs ctl commands */
69# define MSG_STAT 11
70# define MSG_INFO 12
71# define MSG_STAT_ANY 13
72
73/* buffer for msgctl calls IPC_INFO, MSG_INFO */
74struct msginfo
75 {
76 int msgpool;
77 int msgmap;
78 int msgmax;
79 int msgmnb;
80 int msgmni;
81 int msgssz;
82 int msgtql;
83 unsigned short int msgseg;
84 };
85
86#endif /* __USE_MISC */
87