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/* Copyright (C) 1995-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_MSG_H
# error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
#endif
#include <bits/types.h>
#include <bits/ipctypes.h>
/* Define options for message queue functions. */
#define MSG_NOERROR 010000 /* no error if message is too big */
#ifdef __USE_GNU
# define MSG_EXCEPT 020000 /* recv any msg except of specified type */
#endif
/* Types used in the structure definition. */
typedef unsigned short int msgqnum_t;
typedef unsigned short int msglen_t;
/* Structure of record for one message inside the kernel.
The type `struct msg' is opaque. */
struct msqid_ds
{
struct ipc_perm msg_perm; /* structure describing operation permission */
struct msg *__msg_first; /* pointer to first message on queue */
struct msg *__msg_last; /* pointer to last message on queue */
__time_t msg_stime; /* time of last msgsnd command */
__time_t msg_rtime; /* time of last msgrcv command */
__time_t msg_ctime; /* time of last change */
struct __wait_queue *__wwait; /* ??? */
struct __wait_queue *__rwait; /* ??? */
unsigned short int __msg_cbytes;/* current number of bytes on queue */
msgqnum_t msg_qnum; /* number of messages currently on queue */
msglen_t msg_qbytes; /* max number of bytes allowed on queue */
__ipc_pid_t msg_lspid; /* pid of last msgsnd() */
__ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
};
#ifdef __USE_MISC
# define msg_cbytes __msg_cbytes
/* ipcs ctl commands */
# define MSG_STAT 11
# define MSG_INFO 12
/* buffer for msgctl calls IPC_INFO, MSG_INFO */
struct msginfo
{
int msgpool;
int msgmap;
int msgmax;
int msgmnb;
int msgmni;
int msgssz;
int msgtql;
unsigned short int msgseg;
};
#endif /* __USE_MISC */
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