/* Copyright (C) 1995-2018 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

   <http://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 */