uclibc-ng/libc/sysdeps/linux/common/bits/msq.h

/* Copyright (C) 1995, 1996, 1997, 2000 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _SYS_MSG_H
# error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
#endif

#include <bits/types.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 long int msgqnum_t;
typedef unsigned long 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;
    struct msg *msg_first;		/* first message on queue,unused  */
    struct msg *msg_last;		/* last message in queue,unused */
    __kernel_time_t msg_stime;	/* last msgsnd time */
    __kernel_time_t msg_rtime;	/* last msgrcv time */
    __kernel_time_t msg_ctime;	/* last change time */
    unsigned long  msg_lcbytes;	/* Reuse junk fields for 32 bit */
    unsigned long  msg_lqbytes;	/* ditto */
    unsigned short __msg_cbytes;	/* current number of bytes on queue */
    unsigned short msg_qnum;	/* number of messages in queue */
    unsigned short msg_qbytes;	/* max number of bytes on queue */
    __kernel_ipc_pid_t msg_lspid;	/* pid of last msgsnd */
    __kernel_ipc_pid_t msg_lrpid;	/* last receive pid */
};

#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 */